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东半球据此完成问题 此时b点位于 A.晨线昼长8小时 b.昏线昼 Template




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tomski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东半球据此完成问题 此时b点位于 a.晨线昼长8小时 coloring