We drop a piece of metal into a jar full of water, the metal will float if it weighs less than______.A. an equal amount of silverB. an equal amount of goldC. all the water in the jar nowD. the water that leaves the jar

题目

We drop a piece of metal into a jar full of water, the metal will float if it weighs less than______.

A. an equal amount of silver

B. an equal amount of gold

C. all the water in the jar now

D. the water that leaves the jar

相似考题

1.BThe world is not only hungry，it is also thirsty for water． this may seem strange to you，since nearly 75% of the earth is covered with water． But about 97% of this water is sea water．Man can only drink and use the other 3% fresh water that comes from rivers，lakes，under-ground and other places． And we cannot even use all of that，because some of this fresh water has been made dirty．At the moment，this small amount(数量) of fresh water is still enough for us． However，our need for water is getting greater and greater． Only if we take steps to solve this problem now，we can get away from a serious world water shortage later on． The people of the world cannot have an enjoyable life without enough clean water．On one hand we should stop wasting this little water of ours，on the other hand we should find ways to reuse it，but this has not been done widely．Today，in most large cities，water is used only once and it then returns to the sea or runs into underground places．lf we can make it clean again，it can be used once more just as if it were fresh from a spring．But even if large cities reuse its water，we still would not have enough in the future． Where．could we turn to next for water? To the ocean! How can we do to make use of this great a-mount of sea water? We can take the salt from the water to make it fresh．So if we take all these steps，we'll be in no danger of drying up!( )26． Why does the writer say that the world is thirsty for water?A． The amount of fresh water is really very small．B． The people of the world waste too much water．C． The people of the world have to drink a lot of water every day．D． There are too many people in the world needing water．

2.Magnesium has a specific gravity of 1.74, which means that ___ 1.74 times as much as an equal volume of water.A、it is weighedB、weighing itC、its weightD、it weighs

3.One advantage of the all-purpose nozzle is that it ______.A.can fit any size hoseB.converts a stream of water into a fogC.increases the amount of water reaching the fireD.can spray two streams of water at the same time

4.Passage FourArchimedes was a famous Greek mathematician and scientist. He was born around 287 BC and he died in the year 212 BC.Archimedes is most well-known for one specific idea that he came up with. "Archimedes's Principle" states that a solid object which is immersed in a liquid is pushed up by a force which is equal to the weight of the water that the object moves. For example, if you put a piece of wood and a piece of gold the same size in water, only the wood will float. Both the wood and gold move the same amount of water, but the wood weighs less than this water, while the gold weighs more.It is believed that Archimedes discovered this principle when the king of Syracuse asked him to solve a problem. The king wanted to know if his crown was pure gold or a mixture of gold and silver. The king, of course, did not melt his crown to find out. The idea came to Archimedes as he lowered himself into his bath. He noticed how the water spilled out of the tub. He decided to use the same idea for the crown. He knew that a gold crown immersed in water would weigh more than one made of silver. The experiment was done and the goldsmith was proved guilty of trying to cheat the king.48. A good title for the selection is______.A. ArchimedesB. Archimedes's PrincipleC. A Gold and Silver CrownD. The King of Syracuse

更多“We drop a piece of metal into a jar full of water, the metal will float if it weighs less than______.A. an equal amount of silverB. an equal amount of goldC. all the water in the jar nowD. the water that leaves the jar”相关问题

  • 第1题：

    A developer is creating a class Book that needs to access class Paper.The Paper class is deployed in a JARnamedmyLib.jar.Whichthree，taken independently，will allow the developer to use the Paper class while compiling the Book class？（）

    A.The JAR fileis located at$JAVA_HOME/jre/classes/myLib.jar.

    B.The JAR fileis located at$JAVA_HOME/jre/lib/ext/myLib.jar.

    C.TheJ AR fileis located at/foo/myLib.jar and aclasspath environment variable is set that includes /foo/myLib.jar/Paper.class.

    D.The JAR fileis located at/foo/myLib.jar and a classpath environment variable is set that includes/foo/myLib.jar.

    E.The JAR file is located at/foo/myLib.jar and the Book class is compiled using javac-cp/foo/myLib.jar/Paper Book.java.

    F.The JAR file is located at/foo/myLib.jar and the Book class is compiled using javac-classpath/foo/myLib.jar Book.java.


    参考答案：B, D, F

  • 第2题：

    When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .

    A.pick up more of any increase in load

    B.pick up less of any increase in load

    C.share an equal amount of any increase in load

    D.drop an equal amount of any decrease in load


    正确答案：A

  • 第3题：

    One day，a teacher was speaking to a group of students about how to (31) their time．He gave an example those students would never forget．

    He pulled out a wide jar(罐子) and put it on the table． He also took out several rocks and carefully put them into the jar one at a time． When no more rocks would( 32) inside，he asked，"Is this jar full?"

    Everyone in the class shouted，" Yes． "The teacher replied，"Really?" He pulled out a box of small stones． He dumped some in and ) (33)the jar． The stones went down into the spaces (34) the big rocks． He then asked the group once more，"Is this jar full?"

    "Probably not，"one of them answered． "Good ! "he replied． He brought out a glass of sand and dumped the sand into the jar and it went into all of the spaces( 35) ． Once more he asked the question，"Is this jar full?"

    "No!"the class shouted． Once again he said，"Good! Then he poured a cup of water in (36) the．jar was full． Then he asked，"What is the key point here?"One student put up his hand and said，"The key point here is that even if you are busy，you can (37) plan everything well if you try really hard ! "" No， the speaker replied，"that's not the point． The point is if you don-t put the big rocks In(38) ，your ’ll never get them in． What are the 'big rocks in your (39) ? Time with your loved ones，your education，or your dreams? Remember to put these big rocks in first，or you ’II never get them in (40) ．"

    ( )31．

    A．spend

    B．take

    C．kill

    D．arrange


    正确答案：D
    31．D【解析】由题意“一天，一位老师给一组学生讲怎样安排他们的时间”知选D。

  • 第4题：

    共用题干
    The Drink Your Body Needs Most

    1 Our bodies are estimated to be about 60% to 70% water.Blood is mostly water,and
    our muscles,lungs,and brain all contain a lot of water.Water is needed to regulate body
    temperature and to provide the means for nutrients（滋养物）to travel to all our organs.
    Water also transports oxygen to our cells,removes waste,and protects our joints and
    organs.
    2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If you
    are very active,you lose more water than if you do not take much exercise.Symptoms of
    mild dehydration（脱水）include chronic pains in joints and muscles , lower back pain,
    headaches, and constipation（便秘）.A strong smell to your urine , along with a yellow
    color indicates that you are not getting enough water.Thirst is an obvious sign of
    dehydration and in fact,you need water long before you feel thirsty.
    3 A good rule of thumb（好的做法）is to take your body weight in pounds and divide that
    number in half. That gives you the number of ounces（盎司）of water per day that you
    need.For example,if you weigh 160 pounds,you should drink at least 80 ounces of water
    per day.If you exercise you should drink another 8-ounce glass of water for every 20 minutes you are active.If you drink coffee or alcohol,you should add at least an equal
    amount of water.When you are traveling on an airpiane,it is good to have 8 ounces of
    water for every hour you are on board the plane.
    4 It may be difficult to drink enough water on a busy day.Be sure you have water handy at
    all times by keeping a bottle for water with you when you are working,traveling,or
    exercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.There
    are some brands of flavored water available,but some of them have sugar or artificial
    sweeteners that you don't need.

    One cannot live_______.
    A:in your body
    B:without water
    C:before long
    D:for a change
    E:on a busy day
    F:to your weight

    答案：B
    解析：

  • 第5题：

    A developer is creating a class Book， that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar.  Which three， taken independently， will allow the developer to use the Paper class while compiling the Bookclass？（）

    • A、The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.
    • B、The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..
    • C、The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.
    • D、The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.
    • E、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - cp /foo/myLib.jar/Paper Book.java.
    • F、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - classpath /foo/myLib.jar Book.java

    正确答案:B,D,F

  • 第6题：

    多选题
    A developer is creating a class Book， that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar.  Which three， taken independently， will allow the developer to use the Paper class while compiling the Bookclass？（）
    A

    The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.

    B

    The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..

    C

    The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.

    D

    The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.

    E

    The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - cp /foo/myLib.jar/Paper Book.java.

    F

    The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - classpath /foo/myLib.jar Book.java


    正确答案： A,F
    解析： 暂无解析

  • 第7题：

    单选题
    The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
    A

    operating the boiler at less than normal water level

    B

    installing fins on the firesides of water-tubes

    C

    increasing the amount of excess air to the burners

    D

    treating the boiler water with chemical oxygen scavengers


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    Fog forms when the air（）.
    A

    Is 50% water saturated

    B

    Is 90% water saturated

    C

    Temperature is greater than the dew point temperature

    D

    Temperature is equal to，or below the dew point temperature


    正确答案： D
    解析： 暂无解析

  • 第9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

  • 第10题：

    单选题
    One advantage of the all-purpose nozzle is that it（）.
    A

    can fit any size hose

    B

    converts a stream of water into a fog

    C

    increases the amount of water reaching the fire

    D

    can spray two streams of water at the same time


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    If the compressor-discharge temperature is higher than the receiver temperature（）
    A

    increase the amount of cooling water to the condenser

    B

    decrease the amount of cooling water to the condenser

    C

    add more refrigerant to the system

    D

    remove some of the refrigerant from the system


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    What is the normal length of anchor cable used to anchor a vessel?（）
    A

    An amount equal to the depth of the water

    B

    Two times the depth of water

    C

    Three to four times the depth of water

    D

    Five to seven times the depth of water


    正确答案： C
    解析： 暂无解析

  • 第13题：

    The water level showing in a boiler water gauge glass is usually ( ) duringworking.

    A.higher than the actual drum water level

    B.equal to the actual drum water level

    C.increasing due to steam condensation in the glass

    D.lower than actual drum wafer level


    正确答案：D
    解析：水位表上端通汽下端通水，温度不及炉内的高;炉内的炉水是水和汽泡的混合物，故其水位要高些。
    译文：锅炉运行期间，水位计显示的水位比炉内的实际水位低。

  • 第14题：

    下列选项中,用于解压jar文件的命令是()

    A.jar –c

    B.jar –x

    C.jar –v

    D.jar -f


    答案：B
    解析：参数x用于解压

  • 第15题：

    共用题干
    The Drink Your Body Needs Most
    1. Our bodies are estimated to be about 60%to 70%water. Blood is mostly water, and our mus- dles,lungs and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients（滋养物）to travel to all our organs. Water also transports oxy-gen to our cells,removes waste,and protects our joints and organs.
    2. We lose water through urination（排尿）, respiration（呼吸）, and by sweating. If you are very active,you lose more water than if you do not take much exercise.Symptoms of mild dehydration （脱水）include chronic pains in joints and muscles,lower back pain,headaches,and constipation
    （便秘）.A strong smell to your urine,along with a yellow color indicates that you are not getting enough water. Thirst is an obvious sign of dehydration and in fact,you need water long before you feel thirsty.
    3 .A good rule of thumb（好的做法）is to take your body weight in pounds and divide that num- her in half. That gives you the number of ounces（盎司）of water per day that you need.For ex-ample,if you weigh 160 pounds,you should drink at least 80 ounces of water per day.If you ex- ercise you should drink another 8-ounce glass of water for every 20 minutes you are active.If you drink coffee or alcohol,you should add at least an equal amount of water. When you are traveling on an airplane,it is good to have 8 ounces of water for every hour you are on board the plane.
    4 .It may be difficult to drink enough water on a busy day.Be sure you have water handy at all times by keeping a bottle for water with you when you are working,traveling,or exercising. If you get bored with plain water,add a bit of lemon for a touch of flavor. There are some brands of fla-vored water available,but some of them have sugar or artificial sweeteners that you don't need.

    The amount of water your body needs per day is related_________.
    A: in your body
    B: without water
    C: before long
    D: for a change
    E: on a busy day
    F: to your weight

    答案：F
    解析：
    第一段讲到人体约60％～70％是由水组成的；血液大部分都是水，体温的调节，运输滋养物到各个器官，运送氧气到各个细胞，废物排除，人体关节和器官的保护等都离不开水。故本段主要讲的是水对人体的重要性。故选B。


    第二段首句讲到我们通过排尿、呼吸和流汗流失水分。第三句开始主要讲的是脱水的表现。它包括关节与肌肉的慢性疼痛、腰痛、头痛、便秘、口渴等。故选D。


    第三段首句讲的是人体每天所需的饮水量，即一个人每天所需的基本饮水量单位以盎司计，数量是体重磅数的一半。并介绍了在一些特殊情况下所需的饮水量。


    第四段主要讲的是随身携带水瓶及时饮水的必要性。此段首句讲到在繁忙的一天中可能很难补充充足的水分，所以要确保你的手边一直有一瓶水，不管你是在工作、旅游，还是在锻炼，如果嫌水无味，可以加点柠檬。


    由第一段“Our bodies are estimated to be about 60% to 70% water. Blood is mostly water”可知，人体约60%～ 70％是由水组成的，而且人体自身的新陈代谢和机体的运行都离不开水，因此人离开水是活不下去的，故选B。


    由第二段“Symptoms of mild dehydration（脱水）include chronic pains in joints and muscles, lower back pain, headaches , and constipation（便秘）”可知，人体严重缺水便会产生脱水现象，并伴有关节和肌肉疼痛、背痛等症状。故选A。


    由第三段“A good rule of thumb（好的做法）is to take your body weight in pounds and divide that number in half. That gives you the number of ounces（盎司）of water per day that you need.”可知，我们可以把体重用盎司表示出来，盎司的一半就是我们需要的基本饮水量，因此人体每天所需的饮水量与人的体重有密切关系，故选F。


    由第四段“It may be difficult to drink enough water on a busy day. Be sure you have water handy at all times by keeping a bottle for water with you when you are working…”可知，在繁忙的一天中可能很难补充充足的水分，所以要确保你的手边一直有一瓶水，不管你是在工作、旅游，还是在锻炼，即使再忙也不要忘了喝水，故选E。

  • 第16题：

    A developer is creating a class Book, that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three, taken independently, will allow the developer to use the Paper class while compiling the Book class?（）

    • A、The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.
    • B、The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..
    • C、The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.
    • D、The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.
    • E、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -cp /foo/myLib.jar/Paper Book.java.
    • F、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -d /foo/myLib.jar Book.java
    • G、The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -classpath /foo/myLib.jar Book.java

    正确答案:B,D,G

  • 第17题：

    单选题
    Which would you NOT use to report the amount of anchor chain out? Three shots（）.
    A

    at the water's edge

    B

    on deck

    C

    on the bottom

    D

    well in the water


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
    A

    to cut down the amount of cooling water needed

    B

    to prevent an excess amount of cooling water from being discharged to the bilges

    C

    to supply hot water to the evaporator for more economical operation

    D

    None of the above is tree


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）
    A

    maintain low pH in the cooling water

    B

    reduce the cooling water temperature

    C

    increase cooling water hardness

    D

    form a protective film on metal surfaces


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.
    A

    pick up more of any increase in load

    B

    pick up less of any increase in load

    C

    share an equal amount of any increase in load

    D

    drop an equal amount of any decrease in load


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Higher than normal jacket water temperatures occurring in all cylinders of a diesel engine can result from a/an （）.
    A

    oil suction line restriction

    B

    correct amount of coolant

    C

    cavitation erosion in the water jackets

    D

    clogged sea suction strainer


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
    A

    increase the amount of cooling water to the condenser

    B

    decrease the amount of cooling water to the condenser

    C

    add more refrigerant to the system

    D

    remove some refrigerant from the system


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.
    A

    dividing walls

    B

    divided walls

    C

    dividing liners

    D

    divided jackets


    正确答案： A
    解析： 暂无解析

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