单选题The numeral in the center of a wind rose circle on a pilot chart indicates the （）.Atotal number of observationsBaverage wind force on the Beaufort scaleCaverage wind force in knotsDpercentage of calms
单选题
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
A
total number of observations
B
average wind force on the Beaufort scale
C
average wind force in knots
D
percentage of calms
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