单选题难度 5卫生高级职称检验医学下列哪组符合巨幼细胞性贫血( )AA.MCV增高MCH增高MCHC减低BB.MCV增高MCH增高MCHC正常CC.MCV减低MCH减低MCHC正常DD.MCV减低MCH减低MCHC减低EE.MCV减低MCH减低MCHC增高