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Igishusho cyagutse cyakozwe nuburyo bubiri
Kwagura grafite ikorwa muburyo bubiri: imiti na mashanyarazi. Inzira zombi ziratandukanye usibye inzira ya okiside, deacidification, gukaraba amazi, umwuma, gukama nibindi bikorwa ni bimwe. Ubwiza bwibicuruzwa byinshi mubicuruzwa ...Soma byinshi