某学生用如右图所示的装置进行实验点燃酒精灯后观察到小试管内棉花球上沾有的无水硫酸铜粉末变蓝烧杯a中溶液仍保持澄清烧杯b中澄清石灰水变 Template




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tomski某学生用如右图所示的装置进行实验点燃酒精灯后观察到小试管内棉花球上沾有的无水硫酸铜粉末变蓝烧杯a中溶液仍保持澄清烧杯b中澄清石灰水变 coloring