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下列说法正确的是 [ ] A.常温下,Fe(OH)2在水中能自发地转化为Fe(OH)3,该反应的△H<0 B.在NaHSO3溶液中滴入石蕊试液,验证NaHSO3溶液中存在水解平衡 C.在等浓度的NaCl和Na2CrO4稀溶液中滴加AgNO3溶液,先析出AgCl,则Ksp(AgCl)<Ksp(Ag2CrO4) D.医院可以用BaCO3代替BaSO4做“钡餐”给病人进行胃部透视
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