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【单选题】
为了使FeCl 3 溶液中c（Fe 3+ ）/c（Cl - ）增大，可加入的物质是（ ）A.
适量的HCl气体
B.
适量的醋酸钠固体
C.
适量的稀HNO 3
D.
适量的NaOH固体
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