单项选择题
Vessels shall be deemed to be in sight of one another only when one（）from the other.
A.can be observed visually
B.can be observed by radar
C.can be located on the radar
D.can be heard
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相关考题
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单项选择题
Vessel underway means that a vessel is（）.
A.on the way
B.at anchor
C.made fast to a terminal
D.moving against water -
单项选择题
Vessel constrained by her draught is（）.
A.a non-power driven vessel
B.a sailing vessel
C.a power driven vessel
D.a power driven vessel or a non-power driven vessel -
单项选择题
Underway vessels shall at all time maintain a proper look-out（）.
A.by sight and hearing only
B.by all available means besides sight and hearing
C.by all available means except sight and hearing
D.by none of above means
