Muaj ob pawg ntawm yam uas cuam tshuam rau qhov zoo ntawm seamless raj: steel zoo thiab cov txheej txheem dov. Ntau yam ntawm cov txheej txheem dov tau tham ntawm no. Qhov tseem ceeb cuam tshuam yog: kub, txheej txheem hloov, cuab yeej zoo, txheej txheem txias thiab lubrication, tshem tawm ...
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