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（）.<br>A:sound signal<br>B:light signal<br>C:visual signal<br>D:radiotelephone

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（）.
A:sound signal
B:light signal
C:visual signal
D:radiotelephone

出自：海船船员证

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