单项选择题

（）reters to be amount of water vapour in the air.

A.Humidity
B.Temperature
C.Precipitation
D.Wind

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单项选择题

A.NAVETEX receiver
B.Search and Rescue Transponder
C.Emergency Position Indicating Radio Beacon
D.Digital selective calling

单项选择题

A.NAVETEX receiver
B.Search and Rescue Transponder
C.Emergency Position Indicating Radio Beacon
D.Digital selective calling

单项选择题

A.NAVETEX receiver
B.Search and Rescue Transponder
C.Emergency Position Indicating Radio Beacom
D.Digital selective calling