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单选题 患者男性,67岁。有肝硬化病史,因呕血、黑便2天急诊入院。经补液治疗,病情稳定,患者既往多次发作肝性脑病,为预防肝性脑病的发生,应首先采取

A、 卧床休息
B、 灌肠导泻,清除肠道积血
C、 预防性使用抗生素
D、 严格限制蛋白质摄入
E、 输血、补液治疗

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