Vessels shall be deemed to be in sight of one another only when one（）from the other.<br>A:can be observed visually<br>B:can be observed by radar<br>C:can be located on the radar<br>D:can be heard

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

出自：海船船员证

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