《机电产品国际招标机构资格审定办法》规定，机电产品国际招标机_爱下问搜题

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问题单项选择题

《机电产品国际招标机构资格审定办法》规定，机电产品国际招标机构的资格等级分为( )。

A．甲级、乙级和丙级

B．甲级、乙级和暂定级

C．甲级、乙级和预甲级

D．甲级、乙级和预乙级

答案

参考答案：D

选择题

If it ______ tomorrow, our picnic _______ to be put off. [ ]

A. rains; would have

B.. rains; has

C. should rain; would have

D. would rain; would have

单项选择题

煤气易燃易爆，毒性大，易造成人（）死亡。

A.窒息

B.中毒

C.缺氧