Pali mitundu yambiri yamakina njerwa pamsika, yomwe ili mu makina a njerwa yotchedwa konkrite block. Koma kodi mukudziwa za chizindikiritso cha makina ogona njerwa? Kodi mukudziwa zomwe zilembo za njerwa zikuyimira?
Njerwa ndi bwino - zomangira zomangamanga, ndipo zimagwiritsidwa ntchito kwambiri m'minda yambiri. Monga limodzi la mafupa omanga, kufunikira kwa njerwa kumakulitsa pang'onopang'ono. Inde, njirayi ndiyosagwirizana ndi kugwiritsa ntchito makina opanga njerwa. Ndi ver
Mabatani a konkriti amatenga mbali yofunika kwambiri pantchito yomanga, ikugwira ntchito zofunikira pakupanga, makoma, ndi mapedi. Pomwe kufunikira kwa mabatani a konkriti kumakwera, momwemonso kufunikira kwa makina oyenera komanso osinthasintha. Th