【名词&注释】
光吸收、透光率(transmittance)、缺铁性贫血(iron deficiency anemia)、癌基因(oncogene)、缓冲溶液(buffer solution)、总铁结合力(total iron binding capacity)、入射光(incident light)
[单选题]缺铁性贫血患者的实验室检查是
A. 血清铁降低,总铁结合力(total iron binding capacity)降低
B. 血清铁降低,总铁结合力(total iron binding capacity)正常
C. 血清铁正常,总铁结合力(total iron binding capacity)降低
D. 血清铁降低,总铁结合力(total iron binding capacity)增高
E. 血清铁和总铁结合力(total iron binding capacity)增高