单选题What is the light characteristic of a lighted，preferred-channel buoy? （）AGroup flashingBComposite group flashingCInterrupted quick flashingDFixed and flashing
单选题
What is the light characteristic of a lighted，preferred-channel buoy? （）
A
Group flashing
B
Composite group flashing
C
Interrupted quick flashing
D
Fixed and flashing
参考解析
解析：
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