单项选择题
A.小于1% B.2%~3% C.5% D.8% E.20%
A.腭咽肌 B.腭帆张肌 C.腭垂肌 D.腭帆提肌 E.茎突咽肌
A.内眦静脉 B.眼上,下静脉 C.面静脉 D.颈内动脉 E.筛前静脉