Kev xyaum tau ua pov thawj tias qhov kev xaiv ntawm kev txiav cov nqi tsim nyog muaj feem xyuam nrog ntau yam xws li tshuab cuab yeej, cuab yeej, workpiece thiab txheej txheem. Cov txheej txheem ntawm kev xaiv tus nqi ua kom tsim nyog yog raws li hauv qab no:
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