单选题A vessel is in sight of another vessel when she（）.Acan be observed by radarBhas determined that risk of collision existsCis sounding a fog signal which can be heard on the other vesselDcan be observed visually from the other vessel
单选题
A vessel is in sight of another vessel when she（）.
A
can be observed by radar
B
has determined that risk of collision exists
C
is sounding a fog signal which can be heard on the other vessel
D
can be observed visually from the other vessel
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