What's the safe working load of each derrick?

每根吊杠的安全工作负荷是多少？

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Keep safe working load of derricks.

让吊杆在安全负荷下工作。

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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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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?。

youdao