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1923年丹麦化学家布朗斯特提出一种理论叫酸碱质子论，人为规定凡是能够释放质子（H⁺）的任何物质（包括分子或离子）都是酸，任何能接受质子的分子或离子都是碱，根据这一理论，下列各项即属于酸又属于碱的是

A. HNO₃ B. H₂SO₄ C. OH^- D. HCO₃^-