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皮肤黏膜出现发绀时，毛细血管血液还原血红蛋白至少超过（）

A、75g／L

B、50g／L

C、100g／L

D、45g／L

E、30g／L

时间：2021-12-25 13:58 关键词：常见症状与体征心血管内科基础知识结核病基础知识传染病学基础知识

答案解析

B

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