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💢 #حفاظت_دیفرانسیل موتور، ژنراتور و ترانس چطور عمل میکنه؟
https://telegram.me/joinchat/BayUoj-nwoTB4ChK28FH9A
https://telegram.me/joinchat/BayUoj-nwoTB4ChK28FH9A