井下用机车运送爆炸材料时，装有（）的车辆之间，必须用空车隔开，隔开长度不得小于3m。
A.机油
B.炸药
C.柴油
D.电雷管
参考答案：B, D
---I don’t think you saw him just now.
--- .I did see him yesterday.
A．Really
B． Generally .
C．Actually
D．Greatly
