单项选择题
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.
船舶离港之前，所有的吊杆必须纵向收放好。（）A. Before leaving the harbour, al...
单项选择题船舶离港之前，所有的吊杆必须纵向收放好。（）
A. Before leaving the harbour, all derricks must be stowed. B. After leaving the harbour, all derricks must be stowed fore and aft. C. Before leaving the harbour, all derricks must be stowed fore and aft. D. Before leaving the harbour, all heavy derricks must be stowed fore and aft.
请把吊杆甩到舱口上方好吗？（）A. Will you please swing the heavy derri...
单项选择题请把吊杆甩到舱口上方好吗？（）
A. Will you please swing the heavy derrick over the hatch? B. Will you please swing the derrick over the hatch? C. Will you please lower the derrick over the hatch? D. Will you please top the heavy derrick over the hatch?
我们的重吊杆已经长时间不用了。（）A. Our derrick has been out of use for...
单项选择题我们的重吊杆已经长时间不用了。（）
A. Our derrick has been out of use for a long time. B. Our heavy derrick has been out of use for a long time. C. Our crane has been out of use for a long time. D. Our winch has been out of use for a long time.
