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【简答题】
下列离子的溶液与Na 2 S溶液反应，生成黄色沉淀的一组是 (A) Fe 3+ ，Bi 3+ ； (B) Cd 2+ ，Fe 3+ ； (C) Pb 2+ ，AS 3+ ； (D) Sn 4+ ，Cd 2+ 。
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