船舶离港之前，所有的吊杆必须纵向收放好。（）<br>A:Before leaving the harbour, all derricks must be stowed.<br>B:After leaving the harbour, all derricks must be stowed fore and aft.<br>C:Before leaving the harbour, all derricks must be stowed fore and aft.<br>D:Before leaving the harbour, all heavy derricks must be stowed fore and aft.

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.

出自：船舶水手证

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