Makina opangira ma block asintha ntchito yomanga popangitsa kupanga midadada ya konkriti yapamwamba - Kuchita bwino, kusasinthasintha, komanso kuthamanga komwe kumaperekedwa ndi makinawa ndikofunikira kuti akwaniritse kufunikira komanga
Palinso mitundu yambiri ya makina a njerwa pamsika, pakati pawo pali makina a njerwa otchedwa konkire block machine. Koma kodi mukudziwa zozindikiritsa makina oyika njerwa? Kodi mukudziwa zomwe zilembo za nambala ya njerwa zimayimira?