Hozirgi kunda elektr energiyasidan hech qachon foydalanilmagan, ammo elektr energiyasidan foydalaniladigan zamonaviy ixtirolar hali ham boshqa shaklda mavjud bo'lgan dunyoni tasavvur qiling. Iltimos, ushbu ixtirolarning ba'zilari qanday ishlashini tushuntiring.
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