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单项选择题

下列构件中，（  ）不是楼梯的基本组成部分。

A．平台
B．墙体
C．栏杆扶手
D．梯段
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单项选择题
含水层渗透系数K是进行地下水资源评价时必须确定的参数，一般是采用设置抽水试验孔获取相关资料而确定的。在单井稳定流抽水试验时，在承压水完整井的条件下，Q～S关系呈直线时，含水层渗透系数K，用下列( )公式(其中Q为出水量，m3/d；S为水位下降值，m；M为承压水含水层厚度，m；H为自然状态下潜水含水层的厚度，m；h为潜水含水层在抽水试验时的厚度，m；L为过滤器长度，m；r为抽水井过滤器半径，m；R为影响半径，m)求得。
A.
B.
C.
D.
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 believe 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!
Taking cat naps
A.willmakeapersonlazyandtired
B.isabadhabit
C.willmakepeoplefeelbetter
D.canhelppeoplebecomefamous
单项选择题

A、正确
B、错误
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