“rathole”的概念、定义、翻译、参考文献-科学参考

单词	rathole
释义	rathole [`rat´hōl] ^{MINING ENGINEERING} A shallow, small-diameter, auxiliary hole alongside the main borehole, drilled at an angle to the main hole; after core drilling is completed, the rathole is reamed out and the larger-size hole is advanced, usually by some noncoring method.
随便看	level-off position level of free convection level of nondivergence level of saturation level of significance level point level rod level scheme level set level shifting level surface level valve level width Levenstein process lever leverage lever escapement leveret Leverett function lever shears lever switch Levi-Civita symbol levigate levigated abrasive levisticum oil

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