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

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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

单项选择题A(n)（）indicates that is serious and inmmediate danger for vessel, crew and passengers.

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

单项选择题Cirrocumulus belongs to（）.

A.low clouds
B.High clouds
C.Special clouds
D.medium clouds

单项选择题Altostratus belongs to（）.

A.Low cl;ouds
B.High clouds
C.Special clouds
D.medium clouds