“shaft boring”的概念、定义、翻译、参考文献-科学参考

单词	shaft boring
释义	shaft boring Encyclopedia 工学特殊凿井法释 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。
随便看	external regeneration system external releasing agent external resonance external respiration external return external review external schema external-shaping theory of value external shock external similitude center external skills of actors external software quality external-soil spray seeding techniques external sort external source hypothesis external space external sphere condition external stability external standard external standard method external subset external tangency external tangent external target external technology dependency

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