英语词汇“pickard core barrel”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	pickard core barrel
释义	Pickard core barrel Pickard core barrel [′pik·ərd ′kȯr ‚bar·əl] (mining engineering) A type of double-tube core barrel; the distinguishing feature of the barrel is that when blocked the inner barrel slides upward into the head, closing the water ports and stopping the flow of the circulating liquid, without irreparably damaging the bit until the barrel is pulled and the blocked inner tube cleared.
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Pickard core barrel