采煤机按照牵引方式可分为()。
A.钢丝绳牵引采煤机
B.锚链牵引采煤机
C.无链牵引采煤机
D.机械牵引采煤机
参考答案:A, B, C
---Did you enjoy yourself at the party?
---Yes.I appreciated_________.
A.to be invited
B.to have invited
C.being invited
D.having invited
湿热郁蒸气分可见()
A.无汗
B.时有汗出
C.汗大出
D.冷汗淋漓
E.战汗