If the DSC controller is configured for MF/HF operation, the distress will be sent on（）.<br>A:double frequencies<br>B:single frequency<br>C:dedicated frequency<br>D:multiple frequencies

If the DSC controller is configured for MF/HF operation, the distress will be sent on（）.
A:double frequencies
B:single frequency
C:dedicated frequency
D:multiple frequencies

出自：海船船员证

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