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本文介绍了双机容错热备系统的概念，给出了实现双机容错热备系统的软、硬件需求，综述了常见的几种双机容错热备系统的工作模式，最后，给出了双机容错热备系统在微机网上的应用前景。
This paper introduces the concept of dual fault tolerant hot standby system, gives the software and hardware requirements of dual fault tolerant hot standby system, summarizes the common operating modes of several dual fault tolerant hot standby systems, and finally, Application of Machine Fault Tolerant Hot Standby System in Computer Network.