Pankhani yomanga ndi kugwetsa, kukhala ndi zida zoyenera ndikofunikira. Chida chimodzi chofunikira kwambiri chomwe mafakitale ambiri amadalira ndi chophwanya ma hydraulic. Zida zamphamvuzi zitha kugwiritsidwa ntchito kuphwanya konkriti, miyala, ndi zida zina zolimba mosavuta. M'zaka zaposachedwa, msika wa dem ...
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