Cov ntawv ntxhua khaub ncaws yog ua los ntawm cov ntaub ntawv PPS ruaj khov thiab yooj yim. Cov khoom siv no yog lub siab-rigidity crystalline resin engineering yas nrog cov qauv ruaj khov. Nws muaj qhov zoo ntawm kev kub siab ua haujlwm, kev ua haujlwm zoo rwb thaiv tsev, tshuaj lom neeg tsis kam, tsis muaj tshuaj lom, nplaim hluav taws ...
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