What's the safe working load of each derrick?
每根吊杠的安全工作负荷是多少？
Keep safe working load of derricks.
让吊杆在安全负荷下工作。
The safe working load of each derrick is 5 tons.
每根吊杆的安全工作负荷是5吨。
Clearly mark safe working load (SWL) on the air winch below the rig floor.
标明钻台地下气动绞车的安全工作负荷。
What is the safe working load of the bitts in the bow area?
船首区域缆桩的安全工作负荷?。
What is the safe working load of the bitts in the bow area?
船首区域缆桩的安全工作负荷?。
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