單項選擇題（）causing strong winds and rough sea north west Bay of Biscay.
A.Strong low pressure
B.Strong high pressure
C.Steep pressure gradient
D.Steep gradient pressure
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1.單項選擇題Isobars on a synoptic chart are useful in predicting（）.
A.temperature
B.dew point
C.wind velocity
D.relative humidity
2.單項選擇題When a wind blows round clockwise，it is（）.
A.Variable
B.Changing
C.Backing
D.Veering
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When experiencing heavy winds，you should reef sails to（）.
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In the Northern Hemisphere，when the wind at your location is northerly，the low pressure center causing the wind is located to your（）.
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Which condition suggests that your present position lies in the navigable semicircle of a tropical storm（）.
題型：單項選擇題