单项选择题

The satellite system of GAMDSS comprise（）.

A.NAVTEX, COSPAS/SARSAT, EPIRBs and Status Recording-system
B.Inmarsat,COSPAS/SARSAT, EPIRBs and Status Recording-system
C.NAVTEX, Inmarast,EPIRBs and SART
D.Inmarsat, direct Printing Telegraphy

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单项选择题

The terrestrial system of GMDSS consists of（）.

A.radio-telephony, DSC, Direct Printing Telegraphy,Navtex and SART
B.INMARSAT, DSC, Direct Printing Telegraphy, Navtex and SART
C.radio-telephony,DSC,EPLRB,Navtex and SART
D.Status Recording system,DSC,Direct Printing Telegraphy, Navtex and SART

单项选择题

An（）indicates that there is imminent risk for navigation.

A.distress alert
B.urgency message
C.safety message
D.routine message

单项选择题

A(n)（）indicates that there is serious danger for vessel, crew and passenger.

A.distress alert
B.urgency message
C.safety message
D.routine message