A.黏膜免疫与IgA肾病发病机制无关
B.IgA肾病患者血清中IgA1较正常人显著增高
C.IgA肾病患者血清中IgA1的糖基化缺乏
D.在肾小球系膜区沉积的IgA免疫复合物几乎为IgA1
E.IgA肾病患者血清中IgA1较正常人显著降低
