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单项选择题

计算矩形截面混凝土梁的受剪承载力时，应采用混凝土的( )强度取值。

A.轴心抗压强度设计值
B.轴心抗拉强度设计值
C.轴心抗压强度标准值
D.轴心抗拉强度标准值

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Enough sleep is important to health. The amount of sleep（21）depends on the age of the per-son and the conditions in which sleep（22）. The young may need more sleep than the old, but generally eight hours are enough for the health of grown-ups. Some can（23）with less than this amount but（24）may need more. Every person knows his own need. It is then a matter of how to（25）it. Sleep should always be enough to make one relaxed(松弛)and ready for（26）work.
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第（31）题选

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