direct-current relay 直流継电器
direct-current electromagnetic relay [电] 直流电磁继电器
Direct current electromagnetism relay 直流电磁继电器
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The practice shows that LOGO control is simple, reduces electricity fault rate and is worth extended by contrasting LOGO control to direct-current relay control.
运用实践证明：LOGO控制简单方便，减小了电气故障率，值得推广。
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