简述涎石病多发于下颌下腺的原因。
创立细胞学说的科学家是() ["达尔文","施莱登和施旺","袁隆平","列文虎克"]
可引起刺激症状及充血的角膜营养不良有() ["Salzmann结节状变性","Terrien角膜边缘变性","角膜斑块状营养不良","角膜格子状营养不良","Fuchs角膜营养不良"]
前强性层破裂可见于() ["高度近视","圆锥角膜","外伤","先天性青光眼","Fuchs角膜营养不良"]
对肾脏基本无毒性的头孢菌素类药物:() ["头孢噻吩","头孢噻肟","头孢氨苄","头孢唑啉","以上药物对肾脏均有毒性"]
简述慢性复发性腮腺炎腮腺造影表现。