例谈地理“对称性”规律
2013
【“对称性”规律】一、昼长、夜长的对称性1．同一地点，一天中，上午昼长和下午昼长关于地方时12：00对称。【例】图1中的圆表示纬线圈，N为北极点，AB弧表示夜弧，则D点的日出时刻是（ ）
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