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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（）is used for receiving maritime safety information which is automatically printed by the receiver.
A.NAVETEX receiver
B.Search and Rescue Transponder
C.Emergency Position Indicating Radio Beacon
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（）is used for providing homing signals from survival craft for detection by 9Ghzradar.
A.NAVETEX receiver
B.Search and Rescue Transponder
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（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.
A.NAVETEX receiver
B.Search and Rescue Transponder
C.Emergency Position Indicating Radio Beacom
D.Digital selective calling
