... arch crown block 拱顶石 in line crown block 单轴天车 crown block hoisting 起天车 ...
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The drilling line is reeled over the crown block and traveling block to gain mechanical advantage in a "block and tackle" or "pulley" fashion.
钻井用钢丝绳通过天车和游动滑车以滑轮组的形式获得机械上效益。
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