Pab neeg

Nws muaj ntau tshaj 20 xyoo ntawm kev tsim khoom, nrog rau ib xyoos ib zaug muaj peev xwm ntawm 20000 tons.Peb kuj tau ntawm nws tus kheej tsim ntau cov qauv kev qhia tshwj xeeb thiab tau txais ntau patents. Cov khoom ' technical thiab zoo indexes tau mus txog qib thawj hauv ntiaj teb.