Bokosi lopinda, ndilo bokosi lachiwongoladzanja, bokosi lazinthu, lingapangidwe ndikugwiritsidwa ntchito posungirako bwino, lomwe limagwiritsidwa ntchito kwambiri mu makina, galimoto, zipangizo zapakhomo, mafakitale opepuka, zamagetsi ndi mafakitale ena, amatha kupirira kukana kwa asidi ndi alkali, kukana mafuta, osagwiritsa ntchito poizoni. ndi...
Werengani zambiri