“M-design core barrel”的概念、定义、翻译、参考文献-科学参考

单词	M-design core barrel
释义	M-design core barrel [`em di´zīn `kȯr ´bar·ǝl] ^{DESIGN ENGINEERING} A double-tube core barrel in which a 2¹/₂°-taper core lifter is carried inside a short tubular sleeve coupled to the bottom end of the inner tube, and the sleeve extends downward inside the bit shank to within a very short distance behind the face of the core bit.
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