A vessel may use any sound or light signals to attract the attention of another vessel as long as（）.<br>A:white lights are not used<br>B:red and green lights are not used<br>C:the signal cannot be mistaken for a signal authorized by the Rules<br>D:the vessel signals such intentions over the radiotelephone

A vessel may use any sound or light signals to attract the attention of another vessel as long as（）.
A:white lights are not used
B:red and green lights are not used
C:the signal cannot be mistaken for a signal authorized by the Rules
D:the vessel signals such intentions over the radiotelephone

出自：海船船员证

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