A buoy，being a shape of cylinder and with red group flashing，shows that it is（）.<br>A:left-side buoy<br>B:right-side buoy<br>C:a buoy of safety<br>D:a buoy of danger

A buoy，being a shape of cylinder and with red group flashing，shows that it is（）.
A:left-side buoy
B:right-side buoy
C:a buoy of safety
D:a buoy of danger

出自：海船船员证

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