试题详情
- 单项选择题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
- A
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