Study of back-up protection configuration schemes in power market environment

It is described that the sensitivity of impedance back up protection for transformer wind short circuit is very low.

介绍了后备阻抗保护对变压器绕组短路灵敏度很低。

Research of the cooperation of middle-low voltage back up protection of transformer and outlet protection setting

变压器中低压后备保护与出线保护整定配合的研究

Application of comprehensive back up protection device of hoist

浅谈提升机综合后备保护装置

Some Problems Needing Consideration in the Design of the Interphase Back up Protection of the Microcomputer Transformer

微机变压器相间后备保护设计需考虑的几个问题

This paper analyzes the back up protection of varistors.

本文就目前所存在的各种压敏电阻后备保护技术进行分析论述。

Improvement of Operating Technology of Bearings for Back-up Rolls on Medium Plate Mill

中板轧机支承辊轴承使用技术的改进

The paper introduces the new processing and technique such as embedded back-up plate, wholly craning and installing the guide pulley, etc. which are used to install hoist, which can not only improve installing quality and simplify installing procedure, but also can raise the working efficiency.

介绍了提升机安装中采用预埋垫板、导向轮整体吊装等新工艺、新技术，不但提高了安装质量，简化了安装工序，而且还提高了施工效率。

He said he was lucky the airport had a back-up system of its own generators& otherwise he would have to try to land in total darkness.

他说，幸运的是，机场自己有后备的发电设备。否则，他得设法在黑暗里降落。

BlackBerry users cursed their devices, which stopped working because of problems at servers for which a back-up system failed to work.

黑莓用户最近对其运营商骂声不断，这主要是因为手机服务器的备份系统不工作而使手机无法正常工作。

If system breakdowns or failures would result in the permanent loss of records, a back-up system should be provided.

如果计算机的故障或失效会导致记录的永久丢失，则应当提供备份系统。

Favourable social and technical environment and social back-up system are the social basis for the normal development of productive forces of modern society.

良好的社会技术环境和社会支持体系，是现代生产力正常发展的社会基础。

To establish a safe back-up system of double service unit for hospital

建设安全可靠的医院双服务器备份系统

The Technical Back-up System of Budget Management in Commercial Banks

商业银行预算管理技术支持体系研究

Construction and Study on Power Data Back-up System

电力数据备份系统的建设与研究

Everything about it screams performance – its graphics, radical fenders and aggressive stance – and it's not afraid to back it up with some power.

一切关于它的尖叫声的表现-它的图形，激进的护舷和侵略性的立场-它不惧怕将它备份起来，与一些权力。

But in the months that have followed, she's changed her coach, she's improved on clay and she's developed the mental strength to back up her physical power.

但在接下来几个月中，她换了教练，提升了在红土球场上的技术，并磨炼出可作为她体能后盾的意志力。

Application of Automatic Back-up Power Supply Device in Metro

备用电源自投装置在地铁供电系统的应用

Could it be that the elevators have a back up power system?

有没有可能电梯有后备的电力系统？

Use the backup task assistant to back up your system.

使用备份任务助手备份系统。

Make sure you back up your system.

确保对系统进行了备份。