单项选择题
A.polar easterlies B.prevailing westerlies C.roaring forties D.jet streams
The AMVER system requires（）.A.Sailing plans to be sent ...
单项选择题The AMVER system requires（）.
A.Sailing plans to be sent before departure B.More frequent reports in heavy weather C.Arrival reports to be sent within 8 hours of arrival D.A position report within 24 hours of departure
Of the following，（）is not a wind.A.BoraB.GustC.GregaleD...
单项选择题Of the following，（）is not a wind.
A.Bora B.Gust C.Gregale D.Floe
If the center of low pressure is due west of you in the...
单项选择题If the center of low pressure is due west of you in the Northern Hemisphere，which wind direction should you expect（）.
A.South to west B.South to east C.West to north D.North to east
