单选题It is required that ships proceeding at sea should keep continuous watch on（）.AVHF channels 16 and 13BAppropriate DSC distress and safety frequenciesCINMARSAT TDM message channelDVHF channel 70 and channel 8
单选题
It is required that ships proceeding at sea should keep continuous watch on（）.
A
VHF channels 16 and 13
B
Appropriate DSC distress and safety frequencies
C
INMARSAT TDM message channel
D
VHF channel 70 and channel 8
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