（）are operated as a secondary method of alerting in the GMDSS.<br>A:satellite EPIRBs<br>B:Non-satellite EPIRBs<br>C:SES and DSC

（）are operated as a secondary method of alerting in the GMDSS.
A:satellite EPIRBs
B:Non-satellite EPIRBs
C:SES and DSC

出自：海船船员证

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