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单项选择题

王某，女，25岁，因再生障碍性贫血入院。根据医嘱此病人需长时间静脉输入抗胸腺细胞球蛋白治疗。依据合理使用静脉的原则，护士在选择血管时应注意（   ） A.
由近心端到远心端 B.
由远心端到近心端 C.
先粗大后细小 D.
先细直后弯曲 E.
先上后下

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