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单项选择题

上部荷载通过桩传递到桩端坚硬土层或岩层上,桩侧摩阻力忽略去不计。桩上荷载由桩端土阻力承受.这种桩称为（ ）桩。

A.摩擦桩
B.嵌岩桩
C.端承桩
D.静压桩
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单项选择题
比较贵重且稀有的珍珠类型是：（      ）
A、南洋珠
B、 AKOYA海水珍珠
C、淡水珍珠
D、中国南海珍珠
单项选择题
声波在砼中的传播速度是分析桩身质量的指标之一，一般其完好桩的声速应为（）
A.≤3000m/s
B.3500m/s—4500m/s
C.2000m/s-4500m/s
D.2000m/s-3000m/s
单项选择题
Cats are creatures of habit.They like to go to sleep about the same time every day and for a certain length of time.They seem to have a natural clock inside them that tells them when to sleep.
Cats increase their regular sleep with occasional cat naps（打盹）.Some experts feel that humans could also benefit from this habit.Cat naps help to build up energy in the body.They are also a good way to get rid of trouble!Since cats have the same moods（情绪）as humans,some experts behave that people can improve their moods.People might become happier.
A number of famous people have copied cats by taking cat naps during the day.The naps would usually last from 15 to 30 minutes.
Winston Churchill took cat naps.So did Presidents Harry Truman,John F.Kennedy and Lyndon B.Johnson.These famous men were known for their energy.They were also able to work long hours,often into the night.Napping was their secret.
Perhaps more people learn from cats and take naps to feel better and live longer!
This selection was probably written to__________.
A.showhowlazycatsare
B.talkaboutthehabitsofcats
C.tellaboutfamouspeopleandtheirhabits
D.persuadepeopletotakenaps
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