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【简答题】
太阳是地面能量的源泉。太阳辐射的时间和空间差异引起了地理环境的空间分布和春夏秋冬的循环变化。下表是海平面上太阳辐射日总量（×4.2焦／厘米2·日），下图是我国与全球总辐射量对比图。分析图和表，回答问题。 简述太阳辐射量在春分日的空间分布规律，并指出其最主要的影响因素。
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A.
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