Sebakeng sa Changchun Jiutai Longjia Sewage Plant, lisebelisoa tse kang ultrasonic level gauge li sebelisetsoa ho lekanya boemo ba mokelikeli oa tanka e laolang le tanka ea tlhahiso ea mollo.
Sebakeng sa Changchun Jiutai Longjia Sewage Plant, lisebelisoa tse kang ultrasonic level gauge li sebelisetsoa ho lekanya boemo ba mokelikeli oa tanka e laolang le tanka ea tlhahiso ea mollo.