门静脉血流占肝血流，供氧占（）A．75%50% B．50%50% C．25%50_爱下问搜题

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问题单项选择题

门静脉血流占肝血流，供氧占（）

A．75%50%

B．50%50%

C．25%50%

D．80%40%

E．40%60%

答案

参考答案：A

选择题

---Why do you keep looking back?

---I have a feeling that we _______.

A．were followed

B．have been followed

C．are being followed

D．are following

问答题简答题

简述古代外国体育发展的一般特点。