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單項選擇題

（）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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單項選擇題

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

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

單項選擇題

（）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

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