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
单项选择题 Of the following，（）is not a wind.
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（）.
单项选择题 After a cold front passes，the barometric pressure（）.
