单选题When a water is heated, it changes into vapor.A a waterB is heatedC changesD into vapor

题目
单选题
When a water is heated, it changes into vapor.
A

a water

B

is heated

C

changes

D

into vapor

相似考题

1.What is head tank in the closed cooling water system used for?A.for the release of air from the cooling waterB.providing expansion room for heated cooling waterC.a place for implementing water and water treatment agentD.all of the above

2.Metals ______ when they are heated.A.extendB.enlargeC.spreadD.expand

3.Liquid water changes to vapor, ___ is called evaporation.A、whichB、thatC、whatD、this

4.Each cylinder liner on the marine medium speed engines _____.A.is usually cooled by sea waterB.can be replaced when worn outC.is in direct contact with the water in the bore of the cylinderD.can t expand when heated

参考答案和解析
正确答案： A
解析：
更多“When a water is heated, it changes into vapor.”相关问题

  • 第1题：

    When water( ), it will be changed into vapour.

    A. is heated

    B. was heated

    C. will be heated

    D. would heated


    正确答案：A

  • 第2题：

    _____, water turns into ice.

    A、When freezing

    B、When frozen

    C、When it has been frozen

    D、When freezes to it


    参考答案：B

  • 第3题：

    ______is the number of millimeters by which the mean draft changes when a ship passes from salt water to fresh water，or vice versa，whilst floating at the loaded draft．

    A.TPC

    B.The Fresh Water Allowance

    C.Parallel sinking of the ship

    D.UKC


    正确答案：B
    淡水限额允许毫米变化量，当船舶由海水进入淡水中吃水变化，或反之依然，满载浮力吃水变化。

  • 第4题：

    单选题
    As the ocean water changes to ice, it keeps the temperature（）falling too far.
    A

    with

    B

    into

    C

    besides

    D

    from


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced（）
    A

    lower condensing

    B

    higher cooling

    C

    lower cooling

    D

    higher condensing


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    What is the operating principal of a flash type evaporator?（）
    A

    Sea water is heated to boiling temperature under a vacuum

    B

    Sea water is passed over heated plates in a thin film

    C

    Heated sea water is injected into a vacuum chamber

    D

    Sea water is forced through a heated eductor


    正确答案： A
    解析： 暂无解析

  • 第7题：

    问答题
    Practice 1　　Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surroundings. Therefore, when I am of sweat evaporate, a great deal of heat is absorbed from the surface of the body in contact with it. 1______　　2______ The first is the amount of movement of air surrounding the body. The second is the amount of water vapor in the air that surrounds the body.　　3______ For this reason, sweat evaporates very rapidly on windy days, and the rate of heat loss by sweating is much more than on a still day. This accounts for the fact that hot still days are much less comfortable than hot windy days. In contrast, the sweat evaporates very rapidly on hot windy days, and cools the body quickly and effectively.　　4______ When air is carrying the maximum amount of water vapor that it can hold, it is said to be 100% saturated with water vapor. The relative humidity of the air is said to be 100%. Under these conditions the air cannot carry any water, so no water can evaporate. When the relative humidity is high, therefore, sweat cannot evaporate. Instead, it forms large drops and runs off your skin without cooling you.　　5______ It is obvious that under these conditions, evaporation will be much more rapid. Therefore, sweating will be much more effective as a method of losing heat from the body. On a hot dry day, sweat evaporates as soon as it is formed, and you feel reasonably cool even though the temperature of your environment is very high.[A] When the air is very dry and carries no water at all, the relative humidity is said to be 0%.[B] The second factor is the amount of water vapor in the air－the humidity.[C] Hot windy days are much more comfortable than hot still days.[D] This heat transfer occurs even if the environment is hotter than the body.[E] When air moves over the surface of water, the amount of evaporation is greatly increased.[F] You might expect the highest incidence of a heat stroke when the maximum temperature is 100 and humidity is 50%.[G] Two factors affect the rate of evaporation of sweat, and therefore the effectiveness of sweating as a method of cooling the body.

    正确答案： 1.D 空前说“出汗能散热是因为液体蒸发的时候可以带走周围大量的热量。所以当我出汗时,大量的热量被从身体表面吸走了”。D项说“即使周围温度笔体温高时,热量传递也是可以进行的”。符合逻辑关系。故选D。
    2.G 根据关键词“the first,the second”可知,本段讲的是两大因素。G项说“影响汗水蒸发的因素有两个”。符合逻辑关系。故选G。
    3.E 本段讲的是空气流动情况下汗水的蒸发状况。E项说“当空气在水的表面流动时,蒸发量大为增加”。符合文意。故选E。
    4.B 本段讲的是湿度对蒸发的影响。故选B。
    5.A 倒数第二段说“当湿度是100%时,蒸发就不能进行了”。最后一段说“在这种情况下,蒸发速度很快”。说明空处讲的是湿度很低的情况。故选A。
    解析： 暂无解析

  • 第8题：

    单选题
    The heated feedwater entering any flash chamber of a flash-type evaporator will（）
    A

    vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamber

    B

    vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamber

    C

    vaporize, with the remaining water at the temperature greater than it entered the flash chamber

    D

    boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    A definite advantage of using water as a fire extinguishing agent is its characteristic of（）.
    A

    alternate expansion and contraction as water in a liquid state becomes a vapor

    B

    absorption of smoke and gases as water is converted from a liquid to a vapor

    C

    rapid contraction as water is converted from a liquid to a vapor

    D

    rapid expansion as water absorbs heat and changes to steam


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Which of the following descriptions best identifies the operating principal of a flash-type evaporator?（）
    A

    Sea water is heated to boiling temperature while under a vacuum

    B

    Sea water is passed over heated plates in a thin film

    C

    Heated sea water is injected into a vacuum chamber

    D

    Sea water is forced through a heated eductor


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    The water level in a steaming auxiliary boiler will always （）
    A

    rise when the steam pressure is increased

    B

    remain constant as long as the feed pump operates

    C

    fall when the steam pressure is decreased

    D

    vary as the steam demand changes


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    When is the density of the water required to be logged in the logbook of a ship?（）
    A

    Any time the vessel moves from water of one density into waters of a different density

    B

    Prior to getting underway when the vessel is floating in fresh or brackish water

    C

    Only when the vessel moves from fresh water into salt water

    D

    The density of the water is not required to be logged in the unofficial logbook


    正确答案： C
    解析： 暂无解析

  • 第13题：

    Metal ______when heated.

    A.expand

    B. expanded

    C.expands

    D. is expanding


    正确答案：C

  • 第14题：

    When is the density of the water required to be logged in the logbook of a ship?

    A.Any time the vessel moves from water of one density into waters of a different density

    B.Prior to getting underway when the vessel is floating in fresh or brackish water

    C.Only when the vessel moves from fresh water into salt water

    D.The density of the water is not required to be logged in the unofficial logbook


    正确答案：B

  • 第15题：

    单选题
    When a water is heated, it changes into vapor.
    A

    a water

    B

    is heated

    C

    changes

    D

    into vapor


    正确答案： A
    解析：

  • 第16题：

    单选题
    What is head tank in the closed cooling water system used for?（）
    A

    for the release of air from the cooling water

    B

    providing expansion room for heated cooling water

    C

    a place for implementing water and water treatment agent

    D

    all of the above


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    When the derrick changes its （）(角度), its lifting capacity changes correspondingly.
    A

    angel

    B

    length

    C

    height

    D

    angle


    正确答案： C
    解析： 暂无解析

  • 第18题：

    单选题
    Each cylinder liner on the marine medium speed engines （）.
    A

    is usually cooled by sea water

    B

    can be replaced when worn out

    C

    is in direct contact with the water in the bore of the cylinder

    D

    can t expand when heated


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    Latent heat changes the （） of water.
    A

    physical state

    B

    temperature

    C

    atmospheric pressure

    D

    sensible pressure


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）
    A

    The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuum

    B

    The amount of heated feed water discharged from the feed water heater after cndenser is increased

    C

    Fewer non-condensable gases are created by the flow of colder seawater

    D

    More seawater is allowed to pass through the flint stage overflow weir


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    The amount of heat released by steam when it changes to water at the same temperature is called（）.
    A

    latent heat of condensation

    B

    latent heat of vaporization

    C

    latent heat of saturation

    D

    sensible heat of condensation


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    Water ______ be changed into gas, but it ______ be heated to its boiling point.
    A

    must; can

    B

    may; needn’t

    C

    can; must

    D

    need; may


    正确答案： C
    解析：
    句意：水能够变成气体，但必须得它达到沸点时才可以。

  • 第23题：

    单选题
    When bilge water is heated in a holding tank, which one of the following statements is not accurate?（）
    A

    The high temperature facilitates primary gravity separation

    B

    Most of the oil and organic solvents are raised to the top layer

    C

    The high the temperature is, the more the top oil will be collected

    D

    The high temperature has little use on the separation of emulsified oil


    正确答案： D
    解析： 暂无解析

  • 第24题：

    单选题
    Allowance for fresh water refers to（）.
    A

    the provision to be provided when the vessel sails in fresh water area

    B

    the fresh water to be carried by a vessel

    C

    the allowance of fresh water for each crew member when in distress at sea

    D

    the amount of free board decreased when sailing in fresh water area


    正确答案： D
    解析： 暂无解析

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