全球昼夜长短的变化规律以北半球为例 13月21日,太阳直射 ,全球各地昼夜平分,为 小时。 2北半球夏半年3月21日至9月23日 Template




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tomski全球昼夜长短的变化规律以北半球为例 13月21日,太阳直射 ,全球各地昼夜平分,为 coloring