单选题MAYDAY是()信号.A无线电传紧急B无线电话遇险C无线电传安全D无线电话紧急
单选题
MAYDAY是()信号.
A
无线电传紧急
B
无线电话遇险
C
无线电传安全
D
无线电话紧急
参考解析
解析:
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