()are operated as a secondary method of al
问题:
()are operated as a secondary method of alerting in the GMDSS.
A.satellite EPIRBs
B.Non-satellite EPIRBs
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