当油气浓度处于爆炸限时,遇到火源会()。
A、爆炸
B、燃烧
C、汽化
D、无反应
参考答案:A
下列物质的化学式,书写错误的是( )
A.氮气(N2)
B.氧化铝(AlO)
C.氯化亚铁(FeCl2)
D.碳酸钙(CaCO3)
I don't think I'm late. Excuse me, what's the time? ()
A.It says 8:00. But it‘s 5 minutes slow.
B.I‘m sorry I‘ve forgot the time.
C.I was caught in the traffic jam.
D.I‘m sorry to keep you waiting.