给水管道安装后,进行水压试验,试验压力不应小于0.4MPa。( )
参考答案:错
— Why not do your homework for a while?
— _____ There's too much homework today. Let's finish it first. [ ]
A. I'm afraid that's not a good idea.
B. What a good idea!
C. Great.
D. Thank you.
等质量的下列各烃完全燃烧时,消耗氧气最多的是[ ]
A.C2H4
B.C2H6
C.C3H8
D.C6H6