AC contactor短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 交流接触器 AC contactors operate much frequently, and dynamic characteristics of actuating mechanism of AC contactor must be researched in order to exceed the specified operating life. 接触器的操作频率很高，为了保证一定的使用时间，需对其操动机构的动态特性进行研究。 cnki