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

单词	Pickard core barrel
释义	Pickard core barrel [`pik·ǝrd `kȯr ´bar·ǝl] ^{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.
随便看	narrow-gap spark chamber narrows narrow-sector recorder narrow-spectrum antibiotic narsarsukite narwhal N-ary code n-ary composition N-ary pulse-code modulation n-ary tree nasal nasal base breadth nasal bone nasal bridge breadth nasal bridge salient nasal cavity nasal crest nasal height nasal index nasal pit nasal process of the frontal bone nasal process of the maxilla nasal root breadth nasal root salient nasal septum

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