![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[主观题]
有冲击地压的掘进工作面双巷齐头掘进时,两巷错距不得小于多少米?()A.20mB.30mC.40mD.50m
有冲击地压的掘进工作面双巷齐头掘进时,两巷错距不得小于多少米?()
A.20m
B.30m
C.40m
D.50m
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
有冲击地压的掘进工作面双巷齐头掘进时,两巷错距不得小于多少米?()
A.20m
B.30m
C.40m
D.50m
有()的煤巷必须双巷同时掘进时,两工作面的前后错距不得小于50米。
A.瓦斯喷出
B.冲击地压
C.煤与瓦斯突出