【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
查看正确答案A、the load B、safe working load C、safe working D、safe loading work
搜题
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