“workover derrick”的概念、定义、翻译、参考文献-科学参考

单词	workover derrick
释义	workover derrick Encyclopedia 工学修井井架释 workover derrick修井井架用于安放天车、游车等吊升系统设备和工具，并用以起下和存放钻具的钢架结构。
随便看	exist existence Existence and Existents existence and non-existence existence and non-existence grow out of each other existence and uniqueness theorem existence axiom existence condition existence criterion existence domain existence factors existence form of element existence limit of nucleus existence of best approximation existence of lift existence of required elements of crime existence precedes essence existence principle existence problem existence proof existence property existence region existence symbol existence theorem existence theorem for roots

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