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
