It is required that ships proceeding at sea should keep continuous watch on（）.<br>A:VHF channel16 and 13<br>B:appropriate DSC distress and safety frequency<br>C:INMARSAT TDM message channel<br>D:VHF channel 70 and channel 8

It is required that ships proceeding at sea should keep continuous watch on（）.
A:VHF channel16 and 13
B:appropriate DSC distress and safety frequency
C:INMARSAT TDM message channel
D:VHF channel 70 and channel 8

出自：海船船员证

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