单选题难度 5卫生高级职称检验医学胆道梗阻性病变时血清胆汁酸改变正确的是( )AA.CA和CDCA浓度增加但以CDCA为主CA/CDCA1BB.CA和CDCA浓度增加但以CA为主CA/CDCA1CC.CA和CDCA浓度增加但以CA为主CA/CDCA1DD.CA和CDCA浓度增加但以CDCA为主CA/CDCA1EE.CA和CDCA浓度减少但以CDCA为主CA/CDCA1