The radiotelegraph alarm signal is（）.<br>A:SOS sent three times<br>B:ten one-second dashes with a four-second interval between them<br>C:twelve four-second dashes with a one-second interval between them<br>D:twelve one-second dashes with a short interval between them

The radiotelegraph alarm signal is（）.
A:SOS sent three times
B:ten one-second dashes with a four-second interval between them
C:twelve four-second dashes with a one-second interval between them
D:twelve one-second dashes with a short interval between them

出自：海船船员证

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