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Practice 12　　(1) Whatever its underlying reason, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and was

Practice 12　　(1) Whatever its underlying reason, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and was

Practice 12　　(1) Whatever its underlying reason, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the
贰号仓库 2022年06月18日
在电动机控制线路中，已装有接触器，为什么还要装电源开关？它们的作用有何不同？

在电动机控制线路中，已装有接触器，为什么还要装电源开关？它们的作用有何不同？

在电动机控制线路中，已装有接触器，为什么还要装电源开关？它们的作用有何不同？电源开关如铁壳开关、自动空气开关一般不适宜用来频繁操作和远距离控制，而一般的电动机控制都有这方面的要求。交流接触器适用于频繁地遥控接通或断开交流主电路，它具有一般电源所不能实现的遥控功能，并具有操作频率高、工作可靠和性能稳定等优点。但交流接触器保护功能较差，不具备过载、短路等保护功能，而这些功能又是通常电动机控制回路所必须
贰号仓库 2022年06月06日