“crown block”的概念、定义、翻译、参考文献-科学参考

单词	crown block
释义	crown block Encyclopedia 工学钻井装备释 crown block天车安装在石油钻机井架顶部，用于钻井钢丝绳的悬挂和导向、钻井工具的起吊等作业过程的定滑轮组。
随便看	seeds coating of herbage species seed selection seed senescence seed separator seed-setting rate seed shattering seeds hypothesis seed soaking seed soaking equipment seeds of agricultural capitalist in Ming and Qing Dynasties seed solarization seed sower seeds stir-fried before use seeds storage of herbage species seed storage seed storage behavior seed subassembly seed treating equipment seed treatment seed treatment by static magnetic field seed treatment formulation seed treatment method seed treatment of pastoral plants seed viability seed vigor

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