“penetration log”的概念、定义、翻译、参考文献-科学参考

单词	penetration log
释义	penetration log [´pen·ǝ`trā·shǝn ´läg] ^{MINING ENGINEERING} A record of the speed with which a drill penetrates a bore, including such factors as hole size, bit size, mud pressure, rotation speed, and force on the bit; used to determine the thickness of coal and dirt bands in the bore.
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