睫状肌麻痹剂的作用是（） ["A．防止虹膜后粘连","B．拉开新鲜的虹膜后粘连","C．抑制睫状突分泌房水","D．解除睫状肌的痉挛以减轻充血水肿及疼痛","E．解除瞳孔括约肌的痉挛"]
以下关于冻疮临床表现的描述正确的是() ["A．冬末春初好发","B．愈后无色素沉着","C．易反复发作","D．按压不褪色"]
冻疮发病的主要机体因素为() ["A．手足多汗","B．末梢循环较差","C．鞋袜过紧","D．缺乏运动"]
白痱发生于() ["A．角质层或角质层下汗管","B．表皮螺旋形汗管","C．汗腺周围组织","D．真皮－表皮交界处汗管"]
房水闪辉常常可出现在下列疾病() ["A．急性闭角型青光眼急性发作","B．眼球钝挫伤","C．前葡萄膜炎急性期","D．中间葡萄膜炎","E．后葡萄膜炎"]
试述钙拮抗药能治疗心绞痛的原理。
