“unproductive development”的概念、定义、翻译、参考文献-科学参考

单词	unproductive development
释义	unproductive development [¦ǝn·prǝ`dǝk·tiv dǝ`vel·ǝp·mǝnt] ^{MINING ENGINEERING} The drifts, tunnels, and crosscuts driven in stone, preparatory to opening out production faces in a coal seam or ore body.
随便看	d-erythropentose DES desalination desalting desander Desarguesian plane Desargues' theorem desaturated color DeSauty's bridge descaling Descartes laws of refraction Descartes ray Descartes' rule of signs Descemet's membrane descendant descender descending descending branch descending chromatography descending colon descending node grubbing grub screw grubstake grubstake contract

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