Safty Cov Lus Qhia ntawm Ultrasonic Tu

Nws raug nquahu kom tsis txhob siv cov nplaim taws ua kom muaj kev daws teeb meem vim tias cov tshuaj ntxuav ultrasonic nce kub txawm tias thaum tsis nruab nrog lub rhaub.Thaum chav tsev tseem khiav, muab koj txhais tes tso rau hauv kev daws yuav ua rau kub vim qhov kub;kev tsis xis nyob thiab tawv nqaij kuj tshwm sim tau.