Kev sib dhos
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Khoom siv: cov khoom sib txawv muaj.
Txheej txheem: cov txheej txheem tsim khoom sib txawv muaj, tom qab ntawd los ntawm kev siv cov vuam sib txawv lossis sib dhos machining ..
Nto tiav: txawv deg tiav yog muaj acc rau tus neeg siv khoom xav tau.
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