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- 单项选择题这个吊杆的安全工作负荷是6吨。（）
A、The SWL of the derrick is five tons.
B、The SWL of the heavy derrick is six tons.
C、The SWL of the derrick is six tons.
D、The SWL of the crane is six tons.
- C
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A、The SWL of the derrick is five tons.
B、The SWL of the heavy derrick is six tons.
C、The SWL of the derrick is six tons.
D、The SWL of the crane is six tons.
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