判断某酸是几元酸如H3PO4,HNO3,H2Cr2O7,请分别解释,谢谢

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判断某酸是几元酸如H3PO4,HNO3,H2Cr2O7,请分别解释,谢谢判断某酸是几元酸如H3PO4,HNO3,H2Cr2O7,请分别解释,谢谢判断某酸是几元酸如H3PO4,HNO3,H2Cr2O7,

判断某酸是几元酸如H3PO4,HNO3,H2Cr2O7,请分别解释,谢谢
判断某酸是几元酸如H3PO4,HNO3,H2Cr2O7,请分别解释,谢谢

判断某酸是几元酸如H3PO4,HNO3,H2Cr2O7,请分别解释,谢谢
有几个氢就是几元酸