“float collar”的概念、定义、翻译、参考文献-科学参考

单词	float collar
释义	float collar [`flōt ´käl·ǝr] ^{PETROLEUM ENGINEERING} A specialized coupling device inserted in a casing string just above the bottom that contains a check valve to permit downward passage of fluid but not upward passage through the casing.
随便看	excitation index excitation loss excitation potential excitation purity excitation spectrum excitation voltage excitation volume excited state excited-state effect excited-state maser exciter exciter lamp exciter response exciting current exciting line exciton excitron exclusion area exclusion principle exclusive-NOR gate exclusive or exclusive segments exclusive species Excorallanidae excoriation

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