Qhov teeb meem uas tshwm sim ntau rau txhua yam thev naus laus zis ultrasonic yog qhov tsis txaus ntawm kev khiav ncaj ntawm cov yeeb nkab. Nws yuav cuam tshuam rau qhov tseeb raws li qhov tsis txaus ntawm kev khiav ncaj ntawm cov yeeb nkab.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-05-2023