The main structure have: Electromagnet and Heng galvanism source, numerical type Gauss account (the effect of Huo er) and ammeter and volt account, have control dish of illuminate the system.
主要结构有：电磁铁和恒流电源、数字式高斯计(霍尔效应)、安培计和伏特计、配有照明系统的控制盘。
The main structure have: Electromagnet and Heng galvanism source, numerical type Gauss account (the effect of Huo er) and ammeter and volt account, have control dish of illuminate the system.
主要结构有：电磁铁和恒流电源、数字式高斯计(霍尔效应)、安培计和伏特计、配有照明系统的控制盘。
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