“undercutting level”的概念、定义、翻译、参考文献-科学参考

单词	undercutting level
释义	undercutting level Encyclopedia 工学开拓工程释 undercutting level拉底水平为地下矿山回采工作开辟底部自由面，由拉底巷道向两侧扩帮，将矿房底面拉开至足够大，补充爆破空间或者为应力作用下矿石自然崩落创造条件而进行开挖的作业水平。
随便看	backpacker tourism backpack of Lahu nationality backpaddle Back-Paschen effect backpitch backplan back plane backplane back pressure heat and power cogeneration back pressure test for gas well back pressure turbine backproject backprojection operator back propagation back-propagation back propagation algorithm back-propagation algorithm back propagation network back propagation neural network back-propagation neural network back propagation of errors network back propagation，BP back reaction backreflection back reflective material

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