cov khoom

(1) Siv rau cov kab mob, particle filtration nyob rau hauv lub tshuab ua pa thiab tshuaj loog tshuab; (2) muaj peev xwm lim tau zoo thiab txwv tsis pub cov kab mob thiab cov kab mob ntawm kev ua pa thiab ua pa circuits;
(3) tuaj yeem txo tus nqi rau tus kab mob ua pa qis;
(4) tuaj yeem txo qhov mob rau tus neeg mob;
(5) tuaj yeem tiv thaiv cov khoom siv;