单项选择题
The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.
A.cloud movement
B.vessel heading
C.waves
D.swells
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单项选择题
RYUKYU S TO SE 6 BEC 4－5.ISOL SHWRS.SEA 3 M BEC 2 M.SWELL SE 3－4M.This description is likely to be under the heading of（）.
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A.Supplements
B.Annual Summary
C.Navigational Warnings
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