1. Isahaniikozwe mubyuma usuka ibyuma no gukonjesha mugihe cyanyuma.Nicyuma kimeze neza, nubundi buryo, nkurukiramende, bigomba guhindurwa, nukuvuga, bigomba gukorwa mukanda.
2, Theicyumaifite kandi ubunini butandukanye, iyo igenzuwe muri mm 4, ugereranije irashobora kuba mm 0.2 gusa, yitwa icyuma cyoroshye.Niba umubyimba uri hagati ya 4 na 60 mm, ni icyuma giciriritse.Niba umubyimba wibyuma bigera kuri 60, hejuru irashobora kugera kuri mm 115, ifatwa nkicyuma cyibyimbye cyane.Hariho kandi inzira zitandukanye zo gukoraibyuma, nko gukonjesha gukonje no kuzunguruka bishyushye.
3. Hariho ubwoko busanzwe bwibyuma cyangwa ibyuma byujuje ubuziranenge, ibyuma bivanze, ibyuma byamasoko nibindi.Hano hari ibyuma bivanze, ibyangombwa bisabwa biracyari hejuru cyane, kandi hariho imbaraga zingana, kurwanya ubushyuhe bwinshi, imikorere yo kurwanya ruswa ni nziza cyane.
Igihe cyo kohereza: Gashyantare-07-2023