- 1. 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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- 2. 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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- The individual strands of each cable were hung in pulley blocks.
每根钢索的单股钢丝束悬挂在滑车组上。
