A preferred-channel buoy will show a（）.
- Awhite light whose characteristic is Morse (A)
- Bgroup-occulting white light
- Ccomposite group-flashing (2 + 1) white light
- Dcomposite group-flashing (2 + 1) red or green light
问题
A preferred-channel buoy will show a（）
参考解析：
分类：航海学基本知识题库
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