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The safe working load of each derrick is 5 tons.
每根吊杆的安全工作负荷是5吨。
youdao
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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。
youdao
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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。
youdao