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1.The directional power relay is used to control the flow of electricity in a specific direction.
定向电力继电器用于控制电流在特定方向的流动。
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2. The directional power relay is an essential component in many electrical systems.
定向电力继电器是许多电气系统中不可或缺的组成部分。
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3.The directional power relay was developed to improve the efficiency of electrical systems.
定向电力继电器的开发旨在提高电气系统的效率。