A preferred-channel buoy will show a（）.<br>A:white light whose characteristic is Morse (A)<br>B:group-occulting white light<br>C:composite group-flashing (2 + 1) white light<br>D:composite group-flashing (2 + 1) red or green light

A preferred-channel buoy will show a（）.
A:white light whose characteristic is Morse (A)
B:group-occulting white light
C:composite group-flashing (2 + 1) white light
D:composite group-flashing (2 + 1) red or green light

出自：海船船员证

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