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问题 单项选择题

在过电压保护电路中采用延时电路的目的是：（）.

A.防止电路在瞬时过电压时误动作

B.防止电路在瞬时过电压时拒动作

C.防止损坏负载

D.防止损坏发电机

答案

参考答案：A

填空题

甲数是乙数的10倍，如果甲数的小数点向左移动两位是0.078，甲数是______．乙数是______．
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选择题

—Did you see who the driver was?

— No, so quickly _____ that I couldn’t get a good look at his face.

A．does the car speed by

B．did the car speed by

C．the car sped by

D．the car speeds by
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