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Kev lag luam ua si D2 yog hom loj pneumatic tshav kub hloov xovxwm ua rau nias textile lossis cov khoom teeb. Tsim nyog thov kom muaj qhov ruaj khov, khoom ua haujlwm ruaj khov nrog rau lub peev xwm ntawm nias cov chaw nres tsheb hauv ib puag ncig loj-thaj chaw.
PS Thov nyem rau hauv pdf los cawm cov ntawv qhia thiab nyeem ntxiv.