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问题 单项选择题

无黏结预应力筋的涂包质量应符合无黏结预应力钢绞线标准的规定。检查数量为每( )为一批，每批抽取一组试件。

A．40 t

B．50 t

C．60 t

D．70 t

答案

参考答案：C

解答题

一个圆柱的底面半径是5厘米，侧面展开图是正方形，它的体积是多少？
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选择题

Had they known what was coming next, they________ second thoughts. [ ]

A. may have

B. could have

C. must have had  

D. might have had
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