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單項(xiàng)選擇題

（）are operated as a secondary method of alerting in the GMDSS.

A.satellite EPIRBs
B.Non-satellite EPIRBs
C.SES and DSC

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單項(xiàng)選擇題

The maritime access code of telephone mode in INMARSAT-A terminal for the IOR is（）.

A.871
B.872
C.873
D.874

單項(xiàng)選擇題

When you have received GA+ from the CES for the INMARSAT-A telex communication, you should immediately select（）and（）you required.

A.an CES / telex mode
B.an SES telex service
C.the service /the subscriber
D.a satellite /an ocean region

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