An SES operator can chose the most suitable CESs according to（）.<br>A:the routing agreement for a particular ocean region<br>B:The communication service he required<br>C:the positions of his ship and the CESs<br>D:B and C

An SES operator can chose the most suitable CESs according to（）.
A:the routing agreement for a particular ocean region
B:The communication service he required
C:the positions of his ship and the CESs
D:B and C

出自：海船船员证

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