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單項選擇題

A barometer showing falling pressure indicates the approach of a（）.

A.high pressure system
B.low pressure system
C.high dew point
D.low dew point

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單項選擇題

（）the canal transit，the radar was operating.

A.At
B.In
C.During
D.With

單項選擇題

（）should be used during the poor visibility if the radar’s screen shows heavy sea returns.

A.Gain Control
B.Brilliant Control
C.Anti-clutter Sea Control
D.Sweep Intercept

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