“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	International Polar Year International polar year International Police Association international police liaison international political actor/player international political communication international political economy International Politics international politics International Poplar Commission international population conference international population migration International Postal Corporation International Poster Biennale in Warsaw International Poster Biennial in Mexico International Poster Triennial in Toyama International Potash Institute International Poverty Reduction Center in China，IPRCC international practical temperature scale international practical temperature scale, IPTS International Press Institute International Press Photo Agency International Principles of Professional Ethics in Journalism International Prize in Statistics international professional qualifications of construction industry

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