单选题The radiotelegraph alarm signal is（）.ASOS sent three timesBten one-second dashes with a four-second interval between themCtwelve four-second dashes with a one-second interval between themDtwelve one-second dashes with a short interval between them
单选题
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
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