“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	mutually polar lines mutually polar triangles mutually prime elements mutually prime ideals mutually prime numbers mutually separated mutually singular mutually singular measures mutually symmetric mutually unbiased bases mutual medical insurance for employees Mutual mortgage guarantee financing of member enterprises mutual orientation mutual position mutual reinforcement mutual restraint mutual restriction of five phases mutual rooting of yin-yang Mutual Security Act of 1951 mutual spectral density mutual substitution mutual suppression Mutumba Mainga Bull Mutusala manganese deposit Mutus crater

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