这个吊杆的安全工作负荷是6吨。（）<br>A:The SWL of the derrick is five tons.<br>B:The SWL of the heavy derrick is six tons.<br>C:The SWL of the derrick is six tons.<br>D:The SWL of the crane is six tons.

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.

出自：船舶水手证

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