Hauv qee qhov chaw uas cov plua plav hluav taws xob tau tsim nyob rau hauv metallurgy, thee, tshuaj lom neeg kev lag luam, electroplating, polishing, ua zaub mov thiab lwm yam lag luam, qhov chaw muaj plua plav puv feem ntau tshwm sim.Yog li ntawd, xaiv cov khoom cua zoo dua yuav txhim kho ib puag ncig ...
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