Yuav ua li cas txiav txim siab qhov kub thiab lub siab, thiab sijhawm rau kev kuaj cov kev sim kub moulding kev sim

Kub, thiab sijhawm yog peb lub ntsiab lus moulding, thiab cov khoom siv rau cov neeg siv khoom siv tshuab hluav taws xob siv tau cov kev kawm kub moulds yog sim Xws li cov txheej txheem mob .

Tsis muaj qhov sib txawv ntawm kev kuaj cov xovxwm tshiab thiab cov khoom siv kub tsis muaj qhov tseeb nrog cov khoom siv tshwj xeeb thiab cov belongs rau chav kawm I thiab II ntawm chav kawm I thiab II siab rau hauv chav kawm, hauv kev txiav txim kom withstand thiab tswj qhov kub thiab txias thiab kub siab li .