“bell nipple”的概念、定义、翻译、参考文献-科学参考

单词	bell nipple
释义	bell nipple [`bel ´nip·ǝl] ^{PETROLEUM ENGINEERING} A bell-mouthed nipple inserted into the top of oil well casing to allow easy entry of drilling tools and to protect the top of the casing during drilling.
随便看	grapple dredger grapple hook grappling iron Grapsidae graptolite shale Graptolithina Graptoloidea Graptozoa graser Grashof formula Grashof number grasp grass grass crops grasserie grasshopper grasshopper fuse grasshopper linkage grassland grassland climate Grassmann algebra Grassmannian Grassmann manifold Grassmann's laws grass minimum

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