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shaft boring
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特殊凿井法
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shaft boring
矿山钻井法
用钻井机钻凿竖井井筒的特殊凿井法。在地面采用大直径钻井机向地层钻进竖井,以洗井液护壁并排渣,悬浮下沉预制井壁作为永久支护,实现人员不下井的机械化凿井方法。
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Namib Desert
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naming
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naming entity recognition
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Naming Principle of Chinese Approved Drug Name
naming rights of sports event
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