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题目： 未知类型
对I~IV的实验操作现象判断正确的是 
A．实验I：产生红褐色沉淀 B．实验II：溶液颜色变红 C．实验III：放出大量气体 D．实验IV：先出现白色沉淀，后溶解 答案不对？请尝试站内搜索
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