[问答题] 什么是活动性原则?

病儿盛夏外出游玩，现高热无汗，头痛胸闷，身重困倦，纳呆，鼻塞流涕，苔白腻，脉数。治疗首选 ["荆防败毒散","银翘散","新加香薷饮","杏苏散","桑菊饮"] 什么是参观法？ 什么是直观形象法？ 可并发心悸、水肿、痹证的急性传染病是 ["麻疹","幼儿急疹","风疹","水痘","猩红热"] 孕妇感染后可导致胎儿畸形或流产的传染病是 ["麻疹 ","风疹 ","水痘 ","幼儿急疹 ","手足口病"] 什么是活动性原则?