“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	ACT-R AC traction substation Act regarding library services ACTS acts against the administration of public security acts disturbing public order acts impairing public security acts impeding social administration acts infringing upon rights of the personal acts infringing upon rights of the property Acts of Supremacy Acts of the Apostles acts of unlawful interference actticotomy Act to Promote Mexican Investment and Regulate Foreign Investment actual actual aperture actual argument actual blowdown ratio actual capacity actual capital actual carrier actual combination actual cycle of positive displacement compressor actual demand for money

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