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[单选题]
全断面法开挖时,ⅠⅡ级围岩开挖循环进尺不宜大于(),Ⅲ级围岩循环进尺不宜大于();Ⅳ、V级围岩在采取有效的超前预加固措施稳定开挖工作面后,若采用全断面法开挖,循环进尺不得大于()。D
A.4.5m,4.0m,3m
B.3.5m,3.0m,2m
C.2.5m,2.0m,1m
D.2.5m,2.0m,0.6m
查看答案
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.4.5m,4.0m,3m
B.3.5m,3.0m,2m
C.2.5m,2.0m,1m
D.2.5m,2.0m,0.6m
A.1,2
B.2,2
C.2,3
D.2,4