玻璃体的基本病理改变是（）
A.玻璃体炎症
B.玻璃体液化
C.PVD
D.玻璃体出血
E.玻璃体变性
参考答案：B
284. The officers led their men to _______ in battle, so all the villagers came out to award them with food and drink on both sides of the road.
A．victory
B．a triumph
C．failure
D．Defeat
高厂变安全阀的作用是什么？
