Nrog rau txoj kev loj hlob ntawm haiv neeg, daim ntawv thov ntawm flange yeeb nkab fittings yog ntau thiab ntau, yog li dab tsi yog cov txheej txheem ntawm SO flange? Feem ntau muab faib ua plaub hom tshuab, cov hauv qab no rau koj los piav qhia meej. Thawj siv seem hlau pin cob qhia embryo, qis co ...
Nyeem ntxiv