通过实例探讨了正反馈在放大电路中的应用.This paper discusses the application of positive feedback in amplifiers.正反馈放大器是信号级 脉冲形成电路 的基础.Amplifiers with positive feedback are the bases of signal - grade pulse - forming circuits .这种控制方法虽然是有效的, ...
Objective : To investigate the reasons of the second cholesteatoma of postoperative tympanoplasty.目的: 探讨单纯鼓室成形术后发生胆脂瘤的原因并提出预防措施.Objective To study the cause and treatment of external acoustic meatus cholesteatoma.目的探讨外耳道...