单项选择题
（）is formed when the droplets or ice crystals in clouds have become sufficiently large to fall to the ground.
A.Humidity
B.Temperature
C.Precipitation
D.Wind
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相关考题
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单项选择题
（）reters to be amount of water vapour in the air.
A.Humidity
B.Temperature
C.Precipitation
D.Wind -
单项选择题
（）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
D.Digital selective calling -
单项选择题
（）is used for providing homing signals from survival craft for detection by 9Ghzradar.
A.NAVETEX receiver
B.Search and Rescue Transponder
C.Emergency Position Indicating Radio Beacon
D.Digital selective calling
