Kev siv cov cuab yeej siv cua sov ntau
1. Kev kho cua sov: hauv zos los yog kev sib xyaw ua kom zoo, sib deev, ntsuas qhov kub thiab cov cua sov hloov ntawm ntau yam hlau;
Thib ob, kev ua kom sov sov: tag nrho cov forging, ib nrab forging, kub dov, kub dov;
Thib peb, vuam: viav vias ntawm ntau cov khoom lag luam hlau, vuam ntawm ntau cov tshuab ntuag, pom cov plaub hau hniav, cov kav hlau, tooj liab yeeb nkab vuam, vuam ntawm tib hom hlau;
4. Hlau smelting: (nqus tsev) smelting, casting thiab evaporation txheej ntawm kub, nyiaj, tooj, hlau, txhuas thiab lwm yam hlau;
5. Lwm yam kev siv lub tshuab ua kom muaj cua sov ntau: semiconductor ib qho kev loj hlob siv lead ua, kev sib txuam ntawm cov cua sov, lub raj mis lub qhov ncauj sib khi, tshuaj txhuam cov tawv nqaij kom sov ua kom sov, hmoov txheej, hlau cog yas, thiab lwm yam.