上消化道出血量达血容量多少时出现冷汗、心悸、四肢厥冷等急性失血症状 | 听力短文题(Excuse me, could you)

单选题上消化道出血量达血容量多少时出现冷汗、心悸、四肢厥冷等急性失血症状

A、少于10%

B、 10%~15%

C、 15%~20%

D、 20%以上

E、 30%以上

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