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Makina opangidwa mosamalitsa a Aichen - Semi - Makina opangira konkriti mosakayikira ndi nyenyezi yowala pantchito yomanga, ndikuchita bwino kwambiri komanso ntchito zosiyanasiyana, kupereka chithandizo cholimba komanso chodalirika cha v.
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?