單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

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

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The terrestrial system of GMDSS consists of（）.

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

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