问题
单项选择题
用无线电传发送遇险报警收妥确认，应使用的信号（）.
A、RECEIVED
B、RRR MAYDAY
C、RECEIVED MAYDAY
D、RMAYDAY
答案
参考答案：B
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用无线电传发送遇险报警收妥确认，应使用的信号（）.
A、RECEIVED
B、RRR MAYDAY
C、RECEIVED MAYDAY
D、RMAYDAY
参考答案：B