当转动检偏镜时，观测目镜中视场将出现交替变化的明暗光强，则人眼最敏感的视场为： When the polarizer is rotating, the light and dark light intensity in the field of view will change alternately. The most sensitive field of view of the human eye isA.三荫板中央石英片对应的面积为暗区，其余部分为亮区，视场特点为中央暗两侧亮。 The area c

题目

当转动检偏镜时，观测目镜中视场将出现交替变化的明暗光强，则人眼最敏感的视场为： When the polarizer is rotating, the light and dark light intensity in the field of view will change alternately. The most sensitive field of view of the human eye is

A.三荫板中央石英片对应的面积为暗区，其余部分为亮区，视场特点为中央暗两侧亮。 The area corresponding to the central quartz plate of the three shade board is dark area, and the rest part is bright area. The field of view is dark in the center and bright on both sides#B.三荫板中央石英片分界线消失，亮度均匀且较暗的均匀视场。 The dividing line of quartz plate in the center of the three shade board disappears, and the field of view is dark with uniform brightness .#C.三荫板中央石英片对应的面积为亮区，其余部分为暗区，视场特点为中央
相似考题

1.CIn most situations, light helps us see. But nowadays humans are using too much of it so that it is in fact a kind of pollution.When it comes to looking at the night sky, too much light makes it difficult for us to watch some of life’s most wonderful sights: stars, planets and even galaxies(星系).According to scientific research, about 2, 500 stars can be seen by the human eye without using any special equipment(设备). But because of light pollution, you can only see 200 to 300 stars from today’s countryside, and no more than ten stars from a city. In most big cities, people cannot see the sky filled with stars like they did in their childhood.Light pollution affects more than just our view of sky. Research shows that lots of nighttime light can harm wildlife, too.When birds fly to another place over cities, they sometimes get lost by the brightness and fly in circles(圈) until they drop from tiredness. Sea turtles(海龟) need dark beaches for laying eggs, but they can’t find their ideal places because of those bright lights.Too much light at night may even affect human health, but scientists are not sure of that. They are still learning more.In order to prevent things from going worse, governments and some organizations are working to reduce light pollution. Many cities and towns have taken action to reduce the use of lights at night. Lights are used only when and where they are truly needed. They also shine lights down at the ground instead of up into the sky and use lower brightness levels.Hopefully, in the near future, humans can enjoy the clear and beautiful sky again and all the wildlife will live a peaceful and undisturbed life, too.27. Why does the writer think that too much light is a kind of pollution?A. Because there are fewer and fewer stars.B. Because human health has been affected.C. Because too much light is a waste of energy.D. Because some of the wildlife can be harmed.

2.共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.Paragraph 5______A: How Is the Nature of Light Explained Today?B: What Are Sources of Light?C: How Did Physicists Measure the Speed of Light?D: How Does Light Travel?E: How Did People Think of Light Years Ago?F: What Causes a Shadow?

3.Light rays are turned aside by the intense gravitational field surrounding a black hole.A:heightened B:deflected C:rotated D:created

4.共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.Objects are visible to the human eye as light is______.A: sources of lightB: the speed of lightC: the path of lightD: a straight lineE: a beam of lightF: a form of energy

更多“当转动检偏镜时，观测目镜中视场将出现交替变化的明暗光强，则人眼最敏感的视场为： When the polarizer is rotating, the light and dark light intensity in the field of view will change alternately. The most sensitive field of view of the human eye is”相关问题

  • 第1题：

    共用题干
    Solar Power Without Solar Cells

    A dramatic and surprising magnetic effect of light discovered by University of Michigan researchers
    could lead to solar power without traditional semiconductor-based solar cells.
    The researchers found a way to make an"optical________(51)",said Stephen Rand,a professor in
    the departments of Electrical Engineering and Computer Science,Physics and Applied Physics.
    Light has electric and magnetic_______(52).Until now,scientists thought the effects of the mag-
    netic field were so weak that they could be________(53).What Rand and his colleagues found is that at
    the right intensity,when light is traveling through a material that does not_________(54)electricity,the
    light field can generate magnetic effects that are 100 million times stronger than previously expected.Under
    these circumstances,the magnetic effects develop strength_________(55)to a strong electric effect.
    "This could lead to a new kind of solar cell without semiconductors and without absorption to produce
    charge separation,"Rand said."In solar cells,the_________(56)goes into a matenal,gets absorbed and
    creates heat.Here,we expect to have a very low heat load.Instead of the light being absorbed,energy is
    stored in the magnetic moment.Intense magnetization can be induced by intense light and then it is ultimately
    capable of providing a capacitive power________(57)."What makes this possible is a previously unde-
    tected brand of"optical rectification",says William Fisher,a doctoral student in applied physics.In tradi-
    tional optical rectification,light's electric field causes a charge separation,or a pulling_________(58)of
    the positive and negative charges in a material.This sets up a voltage,similar to______(59)in a
    battery.
    Rand and Fisher found that under the right circumstances and in right types of materials,the light's
    magnetic field can also create optical rectification.The light must be shone through a________(60)that
    does not conduct electricity,such as glass.And it must be focused to an intensity of 10 million watts per
    square centimeter. Sunlight isn't this_______(61)on its own,but new materials are being sought that
    would work at lower intensities,Fisher said.
    "In our most recent paper,we show that incoherent light like sunlight is theoretically almost
    _________(62)effective in producing charge separation as laser light is,"Fisher said.
    This new_________(63)could make solar power cheaper,the researchers say.They predict that with
    improved materials they could achieve 10 percent efficiency in converting solar power to usable energy.That's
    equivalent to today's commercial-grade solar cells.
    "To manufacture modern solar cells,you have to do. _______(64)semiconductor processing,"
    Fisher said."All we would need are lenses to focus the light and a fiber to guide it.Glassworks for
    _________ (65).It's already made in bulk,and it doesn't require as much processing.Transparent
    ceramics might be even better."

    _________(60)
    A:material
    B:device
    C:detector
    D:meter

    答案：A
    解析：
    文章第一段提及新的研究发现可能实现不需要传统的半导体太阳能电池而获得太阳 能，因此这里研究者应该是发现了“光学电池”，故选D。
    单词application意思为“应用”;component意思为“成分”;resource意思为“资源”; difference意思为“差异，不同”。这里文章所指的是光的组成成分，故选B。
    本句的大意为：至今为止，科学家认为光的磁场很弱，因此光的磁效应应该是可被忽略 的，故选B。
    单词。 onduct意思为“输送”;produce意思为“生产”;use意思为“使用”;consume意思 为“耗费”。这里指的是光通过不导电的材料，故应选A。
    第三段主要探讨电和磁之间的对比，因此最后一句是两者强度的比较。词组be equiva-lent to意思为“和······等同”，符合句意。
    根据常识可以判断，这里应该指的是光进人材料，经吸收后产生热量，故应选A。
    单词plant作名词意思为“工厂，植物”; source意思为“源头”; equipment意思为“设 备”;line意思为“线路”。根据文章内容可知，这里是指强烈的光照产生强烈的磁化效应，而后 者可以提供一个电容源，故选B。
    在本句中“or a pulling...of the positive and negative charges in a material”是对上句charge separation（电荷分离）的解释，词组pull apart意思为“分开，拉开”，故应选C。
    单词that常用来代替上文中出现的词语，这里它指代的是voltage，故选C。
    由此空下文的“such as glass”可知，这里指的是光线穿过一种材料，故选A。
    由下文的“that would work at lower intensities”可知，此处应该指的是光的强度不够高， 所以才寻找适应这一特点的材料，故选D。
    此处考查的是as...as结构，这里是把太阳光和激光比较，故选B。
    由文章内容可知，本文探讨的是一种科学技术。technology指的是联系到系统、设备和 方法的科学知识，而skill指的是一种技巧，通过培训或训练可习得的本领，故应选B。
    由文章倒数第二句中“and it doesn ' t require as much processing”的提示可知，此空指的 是制作现代太阳能电池时需要进行广泛的加工，单词extensive意思为“广泛的，大量的”，符合 句意。
    上文Fisher提到所需的是能够聚光的镜片和可以导光的纤维物质，而玻璃制品是可以 同时具备这两种功能的，故选D。

  • 第2题：

    What is the most important feature of the backpack invented by Lawrence C.Rome and his colleagues?

    A It produces electricity for electronic devices while the wearer walks.
    B It can be used as cellphones，GPS in the military actions or field studies.
    C It is small and convenient.
    D It is light and easy to carry.

    答案：A
    解析：

  • 第3题：

    共用题干
    Learn About Light

    1 Ancient civilizations were amazed by the existence of light for thousands of years?The Greek philoso-
    phrrs believed that light was made up of countless,tiny particles that enter the human eye and create what
    we call vision.However,Empedocles and a Dutch scientist named Christian Huygens believed that light wag
    like a wave.According to them,light spread out and travelled like a straight line.This theory was accepted
    during the 19th century.
    2 In 1905,Albert Einstein published a research paper in which he explained what is referred to as the
    photoelectric effect.This theory explains that particles make up light.The particles Einstein was referring to
    are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree
    that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to
    see things around us.
    3 Things that give off light are known as sources of light.During the day,the primary source of light is
    the sun.Other sources of light include stars,flames,flashllights,street lamps and glowing gases in glass
    tube.
    4 When we draw the way light travels we always use straight lines.This is because normally light rays
    travel in a straight line.However,there are some instances that can change the path and even the nature of
    light. They are reflection,absorption,interference（干扰）,etc.
    5 Physicists have attempted to measure the speed of light since the early times.In 1849,Hippolyte
    Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed
    a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,
    number of wheel'S teeth and distance of the mirror,he was able to calculate that the speed of light is 313
    million meters per second.In a vacuum（真空）,however,the speed of light is 299,792,458 meters per
    second.This is about a million times faster than the speed of an airplane.

    Some instances such as reflection and absorption can change_________.
    A:sources of light
    B:the speed of light
    C:the path of light
    D:a straight line
    E:a beam of light
    F:a form of energy

    答案：C
    解析：
    第二段前半部分介绍了爱因斯坦的光电效应理论，后半部分则介绍了现代科学家对于 光的看法：他们认为光具有二重性。
    第三段主要讲述了光源的定义和常见的光源，故选B。
    第四段主要讲述了光的传播方式以及影响光的传播方式和性质的因素，故选D。
    第五段以Flippolvte Fizeau为例，介绍了物理学家是如何测定光速的，故选C。
    文章第一段中只提到光像一条直线一样传播，而并非说光是一条直线。另外，由第二段 最后一句话“it is a form of energy that allows us to see things around us.”可知，光是一种能让我 们看到周围事物的能量，故选F。
    山第三段的最后一句话“Other sources of light include stars, flames, flashlights, street lamps and glowing gases in glass tube.”可知，应选A。
    由第四段最后两句话可知，一些因素会影响光的传播路径，这些因素包括光的反射、光 的吸收和光的干扰，故选C。
    由第五段的实例可知,Hippolyte Fizcau是用一束光测出了光的速度，故选B。第4部分；阅读理解第一篇 本篇文章主要讲述了石墨烯对于将未电子学发展的重要性以及人们可用一种简单的方式发 现石、墨烯。

  • 第4题：

    当精密坐标镗床望远镜视场出现像面倾斜，视场偏离现象时，就要对光路中棱镜的安装角度进行凋整。


    正确答案:正确

  • 第5题：

    Field of view( FOV) relates to the ( )

    • A、diameter of the patient apenure of the imager
    • B、maximum diameter of the patient
    • C、diameter of the area that isreconstructed
    • D、the diameter of a pixel

    正确答案:C

  • 第6题：

    tommy has created a sales view in his sales.nsf database. Tommy wants negative numbers in the sales number column in the view parenthesis. which one of the following should tommy do?（）

    • A、select the parenthesis when negative value in the view properties box 
    • B、select the parenthesis when negative value in the column properties box 
    • C、use the @function @negative to set this in the column formula in the view 
    • D、use a formula to format the value in the field on the form that will be displaying in the view

    正确答案:B

  • 第7题：

    jim has created a field hint for the address field. Users tell him this text disappears when they click in the address field. which one of the following is most likely reason?（）

    • A、 the address field is computed 
    • B、 jim should have used a text popup       
    • C、 jim stored the field hint in the database    
    • D、 field hint only display when the user has not clicked in the field （field hint）

    正确答案:D

  • 第8题：

    单选题
    jim has created a field hint for the address field. Users tell him this text disappears when they click in the address field. which one of the following is most likely reason?（）
    A

     the address field is computed 

    B

     jim should have used a text popup       

    C

     jim stored the field hint in the database    

    D

     field hint only display when the user has not clicked in the field （field hint）


    正确答案： B
    解析： 暂无解析

  • 第9题：

    问答题
    Bright field 与 Dark field 何者扫描速度较快?

    正确答案： Dark field
    解析： 暂无解析

  • 第10题：

    单选题
    From your position you observe a rotating white and green light to the north. This light is most likely（）.
    A

    from a submarine on the surface

    B

    the light at Southeast Point

    C

    at an airport

    D

    on a coastal patrol vessel


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    The most common type of AC service generator found aboard ship is the stationary （）.
    A

    electromagnetic field, revolving armature type

    B

    electromagnetic field, oscillatory armature type

    C

    armature, oscillatory electromagnet field type

    D

    armature, rotating electromagnetic field type


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.
    A

    the intensity of the light

    B

    checking the period and characteristics against the Light List

    C

    the color，because the buoy will have only a red or a green light

    D

    Any of the above can be used to identify the light


    正确答案： A
    解析： 暂无解析

  • 第13题：

    共用题干
    Learn about Light
    1 .Ancient civilizations were amazed by the existence of light for thousands of years. The Greek philosophers believed that light was made up of countless,tiny particles that enter the human eye and create what we call vision. However,Empedocles and a Dutch scientist named Christian Huygens believed that light was like a wave. According to them,light spread out and travelled like a straight line. This theory was accepted during the 19th century.
    2 .In 1905,Albert Einstein published a research paper in which he explained what is re-ferred to as the photoelectric effect. This theory explains that particles make up light.The particles Einstein was referring to are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to see things around us.
    3 .Things that give off light are known as sources of light. During the day,the primary source of light is the sun. Other sources of light include stars,flames,flashlights,street lamps and glowing gases in glass tube.
    4 .When we draw the way light travels we always use straight lines. This is because nor-mally light rays travel in a straight line. However,there are some instances that can change the path and even the nature of light. They are reflection,absorption,interference（干扰）, etc.
    5 .Physicists have attempted to measure the speed of light since the early times. In 1849, Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheel's teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.

    Some instances such as reflection and absorption can change______.
    A: sources of light
    B: the speed of light
    C: the path of light
    D: a straight line
    E: a beam of light
    F: a form of energy

    答案：C
    解析：
    该概括大意与完成句子所选的阅读材料为记述文，段落主题相对于论述文而言较松散，因此记述文中的段落大意往往需要考生根据自己的理解而归纳概括出来。解答概括大意题的技巧往往派不上用场。第二段主要讲述现代科学家认同了爱因斯坦的光电效应理论。因此可以判断A选项“当今人们如何解释光的性质”正确。
    第三段第一句“Things that give off light are known as sources of light.”就点明主旨，发光的物体是光源。所以B选项“什么是光源？”正确。
    第四段主要讲述光传播的问题，所以D选项“光是如何传播的”正确。
    第五段的关键字是speed of light，光速。所以C选项“物理学家如何测量光的速度”正确。
    题干意为“人们可以看见物体是因为光……。“从第二段最后一句可知，人们看见物体是因为光是一种能量。所以F项a form of energy正确的。
    题干意为“星星、火焰、手电筒都是……的例子。”第三段“Other sources of light include stars , flames , flashlights...”说明，这些都是光源的例子。所以A选项sourcesof light是正确的。
    题干意为“某些情况下，如反射和吸收可以改变……。”第四段中“there are some instances that can change the path and even the nature of light.They are reflection,ab-sorption , interference , etc.”这说明有一些情况可以改变光的路径。所以C选项the path of light是正确的。
    题干意为“Hippolyte Fizeau做了一个刚试……的实验。”文中最后一段 “Hippolyte Fizeau conducted an experiment by directing a beam of light to a mirror...he was able to calculate that the speed of light...”可知Hippolyte Fizeau通过实验计算出了光速。所以B选项是正确的。

  • 第14题：

    共用题干
    Learn About Light

    1 Ancient civilizations were amazed by the existence of light for thousands of years?The Greek philoso-
    phrrs believed that light was made up of countless,tiny particles that enter the human eye and create what
    we call vision.However,Empedocles and a Dutch scientist named Christian Huygens believed that light wag
    like a wave.According to them,light spread out and travelled like a straight line.This theory was accepted
    during the 19th century.
    2 In 1905,Albert Einstein published a research paper in which he explained what is referred to as the
    photoelectric effect.This theory explains that particles make up light.The particles Einstein was referring to
    are weightless bundles（束）of electromagnetic（电磁）energy called photons（光子）.Today,scientists agree
    that light has a dual（二重）nature一it is part particle and part wave. It is a form of energy that allows us to
    see things around us.
    3 Things that give off light are known as sources of light.During the day,the primary source of light is
    the sun.Other sources of light include stars,flames,flashllights,street lamps and glowing gases in glass
    tube.
    4 When we draw the way light travels we always use straight lines.This is because normally light rays
    travel in a straight line.However,there are some instances that can change the path and even the nature of
    light. They are reflection,absorption,interference（干扰）,etc.
    5 Physicists have attempted to measure the speed of light since the early times.In 1849,Hippolyte
    Fizeau conducted an experiment by directing a beam of light to a mirror located kilometers away and placed
    a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,
    number of wheel'S teeth and distance of the mirror,he was able to calculate that the speed of light is 313
    million meters per second.In a vacuum（真空）,however,the speed of light is 299,792,458 meters per
    second.This is about a million times faster than the speed of an airplane.

    Objects are visible to the human eye as light is_______.
    A:sources of light
    B:the speed of light
    C:the path of light
    D:a straight line
    E:a beam of light
    F:a form of energy

    答案：F
    解析：
    第二段前半部分介绍了爱因斯坦的光电效应理论，后半部分则介绍了现代科学家对于 光的看法：他们认为光具有二重性。
    第三段主要讲述了光源的定义和常见的光源，故选B。
    第四段主要讲述了光的传播方式以及影响光的传播方式和性质的因素，故选D。
    第五段以Flippolvte Fizeau为例，介绍了物理学家是如何测定光速的，故选C。
    文章第一段中只提到光像一条直线一样传播，而并非说光是一条直线。另外，由第二段 最后一句话“it is a form of energy that allows us to see things around us.”可知，光是一种能让我 们看到周围事物的能量，故选F。
    山第三段的最后一句话“Other sources of light include stars, flames, flashlights, street lamps and glowing gases in glass tube.”可知，应选A。
    由第四段最后两句话可知，一些因素会影响光的传播路径，这些因素包括光的反射、光 的吸收和光的干扰，故选C。
    由第五段的实例可知,Hippolyte Fizcau是用一束光测出了光的速度，故选B。第4部分；阅读理解第一篇 本篇文章主要讲述了石墨烯对于将未电子学发展的重要性以及人们可用一种简单的方式发 现石、墨烯。

  • 第15题：

    视野是指当人单只眼固视某一目标时，其视场角的大小。


    正确答案:正确

  • 第16题：

    This cargo light is not （）enough. Please change it for a new one.

    • A、light
    • B、bright
    • C、tight
    • D、dark

    正确答案:B

  • 第17题：

    在旋光现象及应用中，旋光仪用来判断视场明暗的微小变化的方法叫（）

    • A、半荫法
    • B、二分视场法
    • C、三分视场法
    • D、最暗法

    正确答案:A

  • 第18题：

    when eduar tried open the coming attractions view. he got the following error message: incorrect data type for operator or @function: text expected. What did he do to cause this to happen?（）

    • A、entered text in a number field
    • B、neglected to place a formula in a validation event
    • C、neglected to place a formula in a translation event
    • D、combined a text field and a time field in formula

    正确答案:D

  • 第19题：

    单选题
    How is the intensity of a light expressed in the Light Lists?（）.
    A

    Luminous range

    B

    Geographic range

    C

    Nominal range

    D

    Meteorological range


    正确答案： C
    解析： 暂无解析

  • 第20题：

    名词解释题
    暗视野显微镜（dark—field microscope）

    正确答案： 这种显微镜利用特殊的聚光器进行斜射照明，经样品反射或折射的光线进入物镜成像。
    解析： 暂无解析

  • 第21题：

    问答题
    Bright field 与 Dark field 何者灵敏度较好？

    正确答案： Bright field
    解析： 暂无解析

  • 第22题：

    单选题
    Field of view( FOV) relates to the ( )
    A

    diameter of the patient apenure of the imager

    B

    maximum diameter of the patient

    C

    diameter of the area that isreconstructed

    D

    the diameter of a pixel


    正确答案： C
    解析： 答案解析：(视野(FOV)与什么有关：A.成像仪被检者的孔径；B．被检者的最大直径；C．重建区域的直径；D．像素的直径)

  • 第23题：

    单选题
    Which frame field do error detection schemes view to perform their function?（）
    A

    ERR

    B

    Flag

    C

    FCS

    D

    MTU

    E

    MAC

    F

    PDU


    正确答案： C
    解析： 暂无解析

  • 第24题：

    单选题
    From your position you observe a rotating white and green light to the north. This light is most likely（）.
    A

    at an airport

    B

    on a naval mine-countermeasures vessel

    C

    Block Island North Light

    D

    on a vessel engaged in public safety activity


    正确答案： B
    解析： 暂无解析

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