perpetual annuity

The Inspection of the Complications in the Patients Implanted Cardiac Permanent Pacemakers and the Resolving Methods;

250例永久心脏起搏器置入术后并发症及处理

Objective Glass inomer is used to line between the side walls of the cavity and the permanent silver restoration, thus eliminating the possibility of bacteria penetrating the space between enamel and restorative material to prevent the possible secondary decay.

目的　永久性充填后牙体与充填物之间的微缝隙 ,防止渗漏 ,减少继发性龋病的发生。

Starting from the principle of copper electrolysis,the paper describes the progress on copper electroly- sis technology in terms of how to improve product quality,reduce energy consumption and boost productivity,and points out that permanent cathode electrolysis will be future trend for the development of copper electrolysis tech- nology.

从铜电解理论出发,围绕提高产品质量、降低能源消耗、提升劳动生产率三个方面论述了铜电解技术的发展,指出永久阴极电解将成为未来铜电解技术的发展方向。