Nthawi zambiri, mabowo okhala ndi mainchesi a 0.1mm-1.0mm amatchedwa mabowo ang'onoang'ono.Zambiri mwazinthu zomwe zimagwiritsidwa ntchito m'magawo omwe amapangidwa ndi makina ovuta kupanga, kuphatikiza carbide yomangidwa, chitsulo chosapanga dzimbiri ndi zinthu zina zophatikizika ndi ma molekyulu, kotero mitundu yosiyanasiyana ...
Werengani zambiri