单选题Having studied the INMARSAT document, GMDSS document, SOLAS Convention and other international navigation documents, we all know that the Chapter IV of SOLAS Convention is mainly about（）.Athe radio regulationsBthe technical terms and definitionsChow to operate the GMDSS SES equipmentDMaritime Communications
单选题
Having studied the INMARSAT document, GMDSS document, SOLAS Convention and other international navigation documents, we all know that the Chapter IV of SOLAS Convention is mainly about（）.
A
the radio regulations
B
the technical terms and definitions
C
how to operate the GMDSS SES equipment
D
Maritime Communications
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