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
单项选择题 The terrestrial system of GMDSS consists of（）.
单项选择题 An（）indicates that there is imminent risk for navigation.
单项选择题 A(n)（）indicates that there is serious danger for vessel, crew and passenger.
