“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	skiagram skiameter skiascope skiascopy skiatron skibobbing skid skidding skidding cableway skidding tractor skid-resistant coatings skiing ski jumping ski jumping ground Ski Jumping Men Individual Large Hill ski jumping men team large hill ski-jump spillway Skikda skill skilled labour and unskilled labour skilled rate skilled worker school skill-grading system for athletes skill in wielding various weapons skill of museum public relations

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