Hauv kev txiav txim siab ib txwm, daim npav hlau yog ua los ntawm tooj dag thiab stainless hlau. Nws siv cov txheej txheem tshiab thev naus laus zis, muaj, stamping, corroding, luam ntawv, polishing, electroplating, colouring, dispensing, ntim thiab lwm yam dej num. Tom qab polishing, corrosion, Hlau phaib refined ...
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