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对混凝土桥梁主要构件或主要受力部位，应布设测区检测钢筋锈蚀电位，每一测区的测点数不宜少于( ) 个。

A.5
B.10
C.15
D.20
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单项选择题
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,hut（23）eight hours are enough for the health of grown-ups.Some can do 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 be always enough to make one relaxed(松弛)and ready for（26）work.
Fresh air is（27）to sound sleep(酣睡).It is not（28）reason for some people to insist that?it is practical to sleep in the open air.（29）a person can keep himself warm,out-of-door sleeping?probably gives the body（30）complete relaxation.
Ability to sleep is largely a habit.The conditions refen-ed to only lead to sleep.Out-of-door（31）,a good habit of regular drinking and the avoidance of late eating and（32）are all helpful?to sound sleep.Such factors are largely within the（33）of any person.A bath at（34）,neither?hot nor cold but of body temperature,may be helpful to sleep.Sleeping pills should never be taken?except when suggested by（35）.
第（30）题选
A.astrong
B.amost
C.abad
D.anexciting
单项选择题
5.   定量物相分析法中必须采用衍射积分强度。
A、正确
B、错误
单项选择题
24．三种主要食物在胃中排空的速度由快至慢的顺序是（    ）
A．糖类、蛋白质、脂肪
B． 蛋白质、糖类、 脂肪
C．蛋白质、脂肪、糖类
D． 脂肪、蛋白质、糖类
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