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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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更多 “单选题The radiotelegraph alarm signal is().A SOS sent three timesB ten one-second dashes with a four-second interval between themC twelve four-second dashes with a one-second interval between themD twelve one-second dashes with a short interval between them” 相关考题
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