Chifukwa cha kukhazikika kwa malo ogwirira ntchito agalimoto komanso momwe amagwirira ntchito, mulingo wotsekemera wa mafunde ndi wofunikira kwambiri. Mwachitsanzo, ma mota okhala ndi magawo osiyanasiyana otchinjiriza amagwiritsa ntchito mawaya amagetsi, zida zotsekera, mawaya otsogolera, mafani, ma bearing, mafuta ndi mphasa zina ...
Werengani zambiri