单项选择题
Vessel towing with the current shall（）tow more than two boats and they must be towed alongside.
A.at times
B.at any time
C.at no time
D.at moment
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相关考题
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单项选择题
Vessels are required to illuminate their（）to aid identification.
A.funnels
B.tunnels
C.channels
D.handles -
单项选择题
Vessels ramaining（）a few hours should moor with anchors.
A.much than
B.more than
C.many than
D.lot than -
单项选择题
Vessels should be manned（）duly qualified officers and crew adequate（）ensure the safety of navigation.
A.by/to
B.with/to
C.with/for
D.from/for
