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單項(xiàng)選擇題

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

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

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單項(xiàng)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

單項(xiàng)選擇題

（）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

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