步骤1：请查阅「表 2H ─ 初级电路 (Primary Circuits) 以及初级电路和次级电路 (Secondary Circuits) 之间绝缘所需的最小隔空间隙 从最大工作电压等于交流电供应电压的位置 240 Vac...
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Primary and secondary circuits 初级和次级电路
Fuse are also used in many applications on distribution primary circuits and to a limited extent on bulk power high-voltage equipment.
熔断器也可用在配电网的许多一次线路中，在少数情况下，也用于大功率容量的高压设备。
The ignition system is divided into two circuits: the primary and the secondary.
点火系统分为两条回路：初级和次级。
RAM is part of the primary store and is the integrated circuits or chips used to store programs and data while the computer is working.
它是电脑主贮器的一部份；是集成电路或晶片；当电脑运作时，用来贮存程式和数据。
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