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It is required that ships proceeding at sea should...

海船船员考试

单选题

It is required that ships proceeding at sea should keep continuous watch on（）.

发布日期：2021-03-22

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

标签： required ships proceeding sea continuous

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