据报道,每年都有一些煤矿发生“瓦斯”爆炸事故,原因是在采集原煤的坑道中有一种可燃性气体“坑气”。“坑气”的主要成分是[ ]
A.甲烷
B.一氧化碳
C.氢气
D.煤气
答案:A
There is no doubt the boxes were then put on a train for Konigsberg, was at that time a German city on the Baltic Sea.
A.whether, which
B.that, where
C.that, that
D.that, which
法律主要体现的是()的意志。
A.全民
B.统治阶级
C.政党
D.整个社会