Thaum Tus Tshav Kub Kub
Rau kev ua qauv qhia thiab kev sib piv ntawm qhov tshwm sim ntawm lub tshav kub conductivity ntawm cov hlau
Sau koj cov lus ntawm no thiab xa rau peb
Rau kev ua qauv qhia thiab kev sib piv ntawm qhov tshwm sim ntawm lub tshav kub conductivity ntawm cov hlau