To replace the drilling line wrapped around the crown block and traveling block.

为更换缠绕在天车和游动滑车周围的钻井钢丝绳用。

youdao

To replace the drilling line wrapped around the crown block and traveling block.

为更换缠绕在天车和游动滑车周围的钻井钢丝绳用。

youdao