What's the safe working load of each derrick?

每根吊杠的安全工作负荷是多少？

youdao

The safe working load of each derrick is 5 tons.

每根吊杆的安全工作负荷是5吨。

youdao

The safe working load of each derrick is 5 tons.

每根吊杆的安全工作负荷是5吨。

youdao