重金属离子具有毒性。实验室中有甲、乙两种重金属溶液的废液，甲

重金属离子具有毒性。实验室中有甲、乙两种重金属溶液的废液，甲废液经化验呈碱性，主要为有毒离子Ba²^＋，如将甲、乙两种废液按一定比例混合，毒性明显降低，同时碱性减弱。则乙废液中可能含有的离子是(　　)

A．Cu²^＋和SO₄^2— B．Cu²^＋和Cl^—

C．K^＋和SO₄^2— D．Ag^＋和NO₃^—

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重金属离子具有毒性。实验室中有甲、乙两种重金属溶液的废液，甲

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