Nezvekucheneswa kwemafuta casing bare pombi: Mapombi emafuta ega ega anocheneswa uye anosvika pachigadzirwa chekugadzira.Pamberi pekugadzirwa kwepamutemo, tsvina yeoiri, ivhu reraimu, oxide scale rust uye yakare yekuputira mukati nekunze kwepaipi inofanira kucheneswa.Nzira dzekubvisa ngura ...
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