This paper introduces the requirement phase, design phase, programming phase, test phase and maintenance phase of software engineering, and analyses some problems in them.
简要介绍了软件工程中的需求阶段、设计阶段、编程阶段、检验和测试阶段、维护阶段，并对其中的一些问题作了探讨。
Network operation and maintenance: It reports and analyses the operation and maintenance of the operators' networks.
网络运维：报道与分析运营商的网络运营与维护的情况。
It analyses common trouble in the electromechanical maintenance of equipment, to how about maintain and propose some Suggestions.
分析了机电设备维修中常见的故障，对如何进行维修提出了一些建议。
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