提升能力在()t以下的凿井用绞车,可采用手动安全闸。
A、30
B、20
C、10
参考答案:C
用所给词的适当形式填空。
1. I said I _________ (buy) my pop from someone else.
2. Li Ming said he _________ (visit) Shijiazhuang next week.
3. I was a little _________ (confuse) while Li Ming paid two yuan for two pops.
4. Please stop _________ (laugh) loudly, the others were sleeping .
5. It is interesting for him _________ (read) about a foreign country.
在2A+B3C+4D(A、B、C、D均是气体)反应中,表示该反应速率最快的是[ ]
A.υ(A)= 0.5 mol/(L·s)
B.υ(B)= 0.3 mol/(L·s)
C.υ(C)= 0.8 mol/(L·s)
D.υ(D)= 1 mol/(L·s)