下图中相邻两条经线的经度差为30度ab为晨昏线上的两点太阳直射在西半球据此完成此时b点位于a.晨线昼长16小时 b.昏线昼长16 Template




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tomski下图中相邻两条经线的经度差为30度ab为晨昏线上的两点太阳直射在西半球据此完成此时b点位于a.晨线昼长16小时 b.昏线昼长16 coloring