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单项选择题

超声法检测混凝土结构内部缺陷，是否存在缺陷的判据不包括（)

A.声速
B.接受波幅
C.接受频率
D.发射波幅
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相关考题

单项选择题
Sometimes I feel that being the mother of three small children is like operating a large circus(马戏团)． 21 afternoon last week, my three sons playing peacefully in the back yard ( 院子), 22 the ball from one to another．I jumped at the chance to talk to one of my friends 23 the phone, but before I 24 to the phone, I could tell the boys had begun to quarrel with each other about something．I rushed out to 25 peace,but before I got there Charles had 26 a rock at Mark,and hit him in the eye．By the time I got to the back yard,they had begun to 27 about this．Even David,the oldest boy,who won' t usually fight with anybody about 28 ,was involved(卷入) First,! 29 them stop fighting, and then ! examined Mark' s eye．I decided that it wasn' t going to develop into a black eye, but I felt that they should 30 at least a little for 31 they had done．"I' m going to 32 to your father about this when he comes home tonight,"I said．"He and I will think of how to punish you．"Things were 33 quiet after that for about half an hour, and then Charles 34 a glass in the kitchen,and at almost the same 35 ,Mark fell out of the apple tree．
第（33）题答案
A.pretty
B.much
C.verymuch
D.alot
单项选择题
已知椭圆抛物面 和过y轴的平面的交线是圆，则圆的半径为（ ）。
A．2
B．
C．
D．
单项选择题
《公路桥梁荷载试验规程》JTG/T J21-2015规定：新建桥梁静载试验效率宜取（）
A.0.85～1.05
B.0.8～1.0
C.0.85～1.0
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