题目内容

王某，男，45岁，患十二指肠溃疡，突然呕血，面色苍白，脉搏120/min，血压8/6kPa (60/45mmHg)，医嘱．输血400ml。给患者输血的目的是补充( )。

A. 凝血因子
B. 血红蛋白
C. 血小板
D. 抗体
E. 血容量

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