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The radiotelegraph alarm signal is（）.

单选题
2022-09-30 21:15
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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正确答案
C
试题解析
标签： 紧急用语
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