Lub underground Integrated Box Culvert Pwm yog feem ntau siv rau cov kev siv ntawm pej xeem ntau rau centralized tso ntawm lub hwj chim, kev sib txuas lus, xov tooj cua thiab TV, dej haus, kua, Thaum tshav kub kub, roj, raws li zoo li lwm yam nroog underground pipelines. Nws fundamentally daws cov teeb meem ntawm cov "...
saib Ntau