... shaft deformation 井筒变形 shaft development 立井开拓，竖井开拓 shaft drilling jumbo 竖井凿岩吊架 ...
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竖井开拓
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vertical shaft development 立井开拓
inclined shaft development 斜井开拓
blind shaft development 盲竖井开拓
special shaft development 特殊凿井
horizontal shaft development 平硐开拓
vertical shaft development system 竖井开拓
development of vertical shaft 竖井掘进
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