用电报装办（中心）收到批复的供电方案后，在（）个工作日内书面

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问题单项选择题

用电报装办（中心）收到批复的供电方案后，在（）个工作日内书面通知客户。

A.1

B.2

C.3

D.4

答案

参考答案：B

单项选择题

某一先张法预应力混凝土空心板，采用混凝土强度等级C50，采用预应力钢绞线1×7，其直径为d，σ_pe=1000MPa，当对该空心板端部区段进行正截面、斜截面抗裂验算时，其板端的预应力钢筋传递长度（mm），与下列何项数值最为接近（）

A．60d

B．80d

C．55d

D．58d

选择题

一 Did you hear Tom was criticized for his spelling mistakes in his English composition?

一 Yes, but a more careful person _____ so many mistakes. [ ]

A. wouldn't make

B. needn't have made

C. shouldn't make

D. wouldn't have made