General communications are those communications（）.<br>A:between ship stations and shore-based communication networks<br>B:concern the management and operation of ships<br>C:may have an impact of the safety on ships<br>D:all of A, B, C

General communications are those communications（）.
A:between ship stations and shore-based communication networks
B:concern the management and operation of ships
C:may have an impact of the safety on ships
D:all of A, B, C

出自：海船船员证

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