虚证的病理特点是（）
A.邪正交争
B.正邪相持
C.正虚邪盛
D.正虚邪不盛
E.邪盛伤正
参考答案：D
____ he has made a decision, it is not easy for you to make him change his mind.
A．Though
B．Unless
C．Once
D．Until
属于固体栓塞材料的是（）
A.NBCA胶
B.弹簧圈
C.PVA颗粒
D.球囊
E.无水乙醇
