Akwai nau'ikan walda mai juriya da wutar lantarki (erw), kuma akwai nau'ikan walda guda uku, walda ta kabu, waldar gindi da walƙiyar tsinkaya.Na farko, tabo walda Spot walda wata hanya ce ta wutar lantarki juriya waldi wanda a cikinsa waldi ne a harhada cikin wani cinya hadin gwiwa da kuma matsi tsakanin biyu ...
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