输煤系统连锁故障时,必须按逆煤流方向停止设备。()
参考答案:错
---Do you have trouble finishing the work?
---The work is not so difficult as you think.We have finished it already.
A.much
B.any
C.some
D.no
目前测井绞车广泛采用的闭式液压系统的散热条件()。
A、好
B、较好
C、一般
D、差