1) master-slave switching
双机切换
1.
： This paper researches the achieved target，technology mechanism and application of duplex server and information with a duplicate copy in communication system．Associated with practical design，technology and implement based on master－slave is set forth，as well as condition and evolvement of master－slave switching
并结合实际系统设计，着重阐述了通信系统基于主备用方式的双机热备份技术及其实现，描述了导致双机切换的条件以及各工作模式下的状态演变。
2) Two-plane switching procedures
双机切换程序
1.
This paper introduces the application of unity PLC of Schneider electric in the three gorges project;focus on the application of NOE 77111 and the Two-plane switching procedures in the project,bring forward some problem in the practical application,and give some advice on the development direction of PLC software.
本文介绍了施耐德公司的最新产品Unity PLC在三峡项目中的应用,着重讨论了NOE 77111及双机切换程序在项目中的具体应用,提出了实际应用中遇到的问题,就PLC软件的发展方向提出了相应的建议。
4) two-speed switchover
双速切换
5) duplex switch
双工切换
1.
The monitor subsystem is mainly responsible for status collection,duplex switching and on-off control of the solid state transmitter.
监控分机主要负责固态发射机的状态采集、双工切换及开关控制。
6) fan switch
风机切换
补充资料：面包切换机
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说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条