pitshaft

  • 网络竖井;井筒

pitshaftpitshaft

pitshaft

竖井

P ... pit prospecting method 坑探法 pit shaft 竖井 pit slope 露天矿边坡 ...

井筒

foundation pit engineering_翻译 ... 缺陷: Pit 井筒Pit shaft 冲刷坑: scoured pit ...

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