服用保列治后可使PSA值下降()A．20％ B．30％ C．40％ D．50％ E．

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问题单项选择题 A1型题

服用保列治后可使PSA值下降()

A．20％

B．30％

C．40％

D．50％

E．60％

答案

参考答案：D

单项选择题

图示电路，u-141sin（314t-30°）V，i=14.1sin（314t-60°）A，这个电路的有功功率P等于（）。

A.500W

B.866W

C.1000W

D.1988W

单项选择题

Each hand portable fire extinguisher must be marked with（）.

A.the name of the vessel on which it is located

B.the date that it was installed

C.the names of the individuals qualified to use it

D.an identification number