英语词汇“θ213368”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	θ213368
释义	society > occupation and work > equipment > oil and natural gas recovery equipment > [noun] > blocking device (2) packer1870 Originally U.S. A device inserted into an annular space in an oil well (such as that between the casing and the tubing) in order to block the flow… storm choke1966 a safety valve installed in an oil-well pipe below the ocean surface, designed to stop the oil flow should it exceed a predetermined rate as a result…
随便看	to make oneself strong to make oneself useful to make open doors to make or be bold with to make or break to make or break contact to make or do asseth to make or do courtesy to make or enter into a covenant to make or find a lodgement to make or give a bravado to make or give assault to make or go the circuit of to make or keep scourage to make or lay await on to make or mar to make or pay court to to make or pay one's court to to make or show a specified semblance to make or show semblance to make or take a step to make or take but one step to make or take but one step from — to to make or undertake a journey to make orts of

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