Katswiri wogulitsa zinthu za graphite, graphite kwa EV, mafuta, ng'anjo ndi mafakitale ena aliwonse.

Chifukwa chiyani graphite ingagwiritsidwe ntchito ngati pensulo?
(Chifukwa chiyani graphite ingagwiritsidwe ntchito ngati pensulo?) The main components of the lead core of the pencil are graphite and clay. According to the national standard, pencils are divided into 18…


























































































