Ho sebelisoa ha valve e phahameng ea mocheso ho fehlang matla a mocheso le likarolo tse ling
Valve e phahameng ea mocheso ke valve e sebetsang tlas'a maemo a phahameng a mocheso, haholo-holo e sebelisoang ho petroleum, indasteri ea lik'hemik'hale, metallurgy, tlhahiso ea matla a mocheso le liindasteri tse ling. Haholo-holo tšimong ea tlhahiso ea matla a mocheso, bohlokoa ba ho phahama ...
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