下列哪些情况可发生心律失常() ["胆囊切除","眼科手术","颈动脉窦刺激","肠系膜牵拉","大血管手术"]	鞘膜积液分为哪几种情况() ["睾丸鞘膜积液","精索鞘膜积液","交通性鞘膜积液","婴儿型鞘膜积液","以上都是"]	直流电药物离子导入与温热配合应用时顺序如何() ["先后无关","先行离子导入","交替进行","后行离子导入","间隔时间数小时以上"]	影响牙釉质酸蚀效果的因素有() ["酸蚀剂的种类","酸蚀剂的浓度","酸蚀时间","酸蚀剂的剂型","以上均是"]	下列哪些情况可有P-R间期延长() ["迷走神经紧张时","药物作用,洋地黄","急性风湿性心肌炎","慢性冠状动脉供血不全","房间隔缺损"]	弹簧式安全阀频跳或颤振的原因?