男，45岁，消化性溃疡经常发现黑便，无其他不适，出血量约为A:5ml B:10ml C:40ml D:60ml E:1000ml

作者: tihaiku 人气: - 评论: 0

问题男，45岁，消化性溃疡经常发现黑便，无其他不适，出血量约为

选项 A:5ml B:10ml C:40ml D:60ml E:1000ml

答案 D

解析当消化道出血量在50～70ml时，可以出现黑便。

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