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單項(xiàng)選擇題

The area of strong westerly winds occurring between 40°S and 60°S latitude is called the（）.

A.polar easterlies
B.prevailing westerlies
C.roaring forties
D.jet streams

單項(xiàng)選擇題

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