Kukhazikitsa ndi kukhazikitsa
Tipereka malangizo okhudza kukhazikitsa ndi kugwiritsa ntchito mapampu
Zida zobwezeretsera
Kupezeka bwino kwa zida zosinthira kumachepetsa nthawi yogwira ntchito yosakonzekera komanso kumateteza makina anu kuti asagwire ntchito bwino.