介入治疗中DSA的限度是（）
A.具有C臂系统
B.减少碘对比剂的用量
C.影像后处理
D.视野较小
E.实时成像
参考答案：D
There are mistakes in Mary's project, so her teacher is pleased with her work. [ ]
A. a little
B. little
C. a few
D. few
紫苏可用治（）
A.水肿
B.脾胃气滞
C.胸闷呕吐
D.风寒感冒
E.进食鱼蟹中毒
