To make an electromagnet you need to send a current through the wire.
为电磁体你需要对金属线送电。
To make an electromagnet you need to send a current through the wire.
为电磁体你需要对金属线送电。
Lower the pressure and largen the current of common electric current through transformer.
● 是利用普通电流经过变器作用,使电
降低而电流变大。
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