Cov khoom siv stamping yog hais txog cov txheej txheem ua kom tau raws li qhov yuav tsum tau ua thiab qhov loj me ntawm cov khoom siv los ntawm kev tawm dag zog sab nraud ntawm cov ntaub ntawv, xws li phaj thiab siv nrog punch thiab stamping tuag thiab tom qab ntawd ua cov yas deformation lossis sib cais.Hauv kev xav...
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