中度上消化道出血是指15min内失血量占总血量的 | 听力短文题(Excuse me, could you)

单选题中度上消化道出血是指15min内失血量占总血量的

A、 10%左右

B、 15%左右

C、 20%左右

D、 25%左右

E、 30%左右

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