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单选题
The safe working load of the derrick is 5 tons.（）
A
吊杆的安全工作负荷量是5吨
B
龙门吊的安全工作负荷量是5吨
C
起货机的安全工作负荷量是5吨
D
重吊杆的安全工作负荷量是5吨
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