上消化道出血是否表现为呕血或黑便,主要取决于A.出血的速度和量B.出血部位的高低C.病变的性质D.凝血机制E.胃肠蠕动情况

作者: rantiku 人气: - 评论: 0
问题 上消化道出血是否表现为呕血或黑便,主要取决于
选项 A.出血的速度和量 B.出血部位的高低 C.病变的性质 D.凝血机制 E.胃肠蠕动情况
答案 A
解析

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