The numeral in the center of a wind rose circle on a pilot chart indicates the （）.<br>A:total number of observations<br>B:average wind force on the Beaufort scale<br>C:average wind force in knots<br>D:percentage of calms

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

出自：海船船员证

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