... open cog 空心垛式支架 opening up by tunnels 平硐开拓 operating platform 工专 ...
基于70个网页-相关网页
... portal type 井筒类型 adit development 平硐开拓 slope development 斜井开拓 ...
基于8个网页-相关网页
短语
平硐开拓法
development method with adit
平硐溜井开拓
[矿业]
drift-orepass development
-
opening up by tunnels
adit development
drift development
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