An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.
- Asound signal
- Blight signal
- Cvisual signal
- Dradiotelephone
问题
An icebreaker may use the code letter
参考解析：
分类：液化天然气操作工题库
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