- Kugereranya uburyo ibyuma bitagira umugese birwanya ingese
Icyuma cya 301 kidasagwa kigaragaza ko gikomera mu gihe cyo guhindura imiterere y'icyuma kandi gikoreshwa mu bihe bitandukanye bisaba imbaraga nyinshi.
Icyuma cya 302 kigizwe n'icyuma cya 304 kidasaza, gifite ingano nini ya karuboni.
302B ni ubwoko bw'icyuma kitagira umugese gifite silikoni nyinshi, gifite ubushobozi bwo kurwanya ogisijeni nyinshi mu bushyuhe bwinshi.
303 na 303Se ni ibyuma bicukura bidakoresha sulfure na selenium, bikoreshwa cyane cyane mu gukata bidakoresheje sulfure no mu gushushanya aho hakenewe urumuri rwinshi.
Igihe cyo kohereza: Gashyantare-03-2021