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我想知道解析中π/4-（-π/4)=T/4+kT 不是应该是π/4-（-π/4)=T/4+（kT）/2吗
怎么消参得到椭圆方程，谢谢！！！
求化学大神 今天我用质量分数大约60%浓盐酸将吡啶硫酸锌（可能含有Fe离子杂质）溶解，溶解后溶液呈深蓝色；置于室外用自然光光照不到30分钟，溶液颜色大幅度变浅，变成浅蓝绿色，求吧里化学大神帮帮忙解释蓝色溶液时怎么来的
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