已知O点为极点,MN线上北极星仰角始终为69°,AB是昼夜分界线,C点为AB与MN两线的切点,CD所在经线为180°,此时全球日期相同.问:此时太阳直射点是?A,(21°S,180°) B,(21°S,0°)C,(21°N,180°) D,(2
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![已知O点为极点,MN线上北极星仰角始终为69°,AB是昼夜分界线,C点为AB与MN两线的切点,CD所在经线为180°,此时全球日期相同.问:此时太阳直射点是?A,(21°S,180°) B,(21°S,0°)C,(21°N,180°) D,(2](/uploads/image/z/2082698-26-8.jpg?t=%E5%B7%B2%E7%9F%A5O%E7%82%B9%E4%B8%BA%E6%9E%81%E7%82%B9%2CMN%E7%BA%BF%E4%B8%8A%E5%8C%97%E6%9E%81%E6%98%9F%E4%BB%B0%E8%A7%92%E5%A7%8B%E7%BB%88%E4%B8%BA69%C2%B0%2CAB%E6%98%AF%E6%98%BC%E5%A4%9C%E5%88%86%E7%95%8C%E7%BA%BF%2CC%E7%82%B9%E4%B8%BAAB%E4%B8%8EMN%E4%B8%A4%E7%BA%BF%E7%9A%84%E5%88%87%E7%82%B9%2CCD%E6%89%80%E5%9C%A8%E7%BB%8F%E7%BA%BF%E4%B8%BA180%C2%B0%2C%E6%AD%A4%E6%97%B6%E5%85%A8%E7%90%83%E6%97%A5%E6%9C%9F%E7%9B%B8%E5%90%8C.%E9%97%AE%EF%BC%9A%E6%AD%A4%E6%97%B6%E5%A4%AA%E9%98%B3%E7%9B%B4%E5%B0%84%E7%82%B9%E6%98%AF%3FA%2C%EF%BC%8821%C2%B0S%2C180%C2%B0%EF%BC%89+B%2C%EF%BC%8821%C2%B0S%2C0%C2%B0%EF%BC%89C%2C%EF%BC%8821%C2%B0N%2C180%C2%B0%EF%BC%89+D%2C%EF%BC%882)
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