Zoo siab heev uas tau muaj phooj ywg los ntawm kev deb! —- Confucius
Txhawm rau txhawm rau txhawm rau txhawm rau HEPA Lim, nws paub zoo tias siv aerosol photometer rau kev sim. ZR-6012 Aerosol Photometer tau raug kuaj los ntawm engineers hnub thiab hmo ntuj. Hnub no yuav tso pub...