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问题 单项选择题

离心泵启动时，以空转（）为宜

A.1min

B.2～3min

C.3～5min

D.15～30s

答案

参考答案：C

单项选择题

消费税在我国始于( )年施行。

A．1984

B．1985

C．1994

D．1995
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单项选择题

Since 2008, there have been more and more famous people in the acting profession whose name becomes "smelly", and whose life and career are between the ______ and the block.

A. needle
B. twiddle

C. riddle

D. beetle
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