Kev nqis peev casting, tseem hu ua poob ciab casting, tau tsim 5,000 xyoo dhau los.Txoj kev casting no muab qhov tseeb, rov ua dua thiab ntau yam nrog cov hlau sib txawv thiab kev ua haujlwm siab alloys.Txoj kev casting no yog tsim rau casting tsw thiab precision qhov chaw ...
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