Kuki igikoresho cyamashanyarazi ya valve kigaragara kurenza urugero? Ni ubuhe buryo bwo kurinda?
Kuki igikoresho cyamashanyarazi ya valve kigaragara kurenza urugero? Ni ubuhe buryo bwo kurinda? Ibikomoka kuri peteroli, amashanyarazi, metallurgie nizindi nganda bisaba gukora ubudahwema, bworoshye, burebure. Kubwibyo, saba ikoreshwa rya valve igomba kugira ...
reba ibisobanuro birambuye