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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's the safe working load of each derrick?
每根吊杠的安全工作负荷是多少?
The safe working load of each derrick is 5 tons.
每根吊杆的安全工作负荷是5吨。
The health board said it had a total of 12 specialist beds, catering for a "safe working load" of 70 stone, in operation.
BBC: Rise in number of Scots hospitals buying 'obesity beds'
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