单选题Vessels shall be deemed to be in sight of one another only when one（）from the other.Acan be observed visuallyBcan be observed by radarCcan be located on the radarDcan be heard
单选题
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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