Lawv teev thawj nrhiav tau nrhiav nrhiav nrhiav tau, Lawv nrhiav tau tej tswvyim thiab tej tswvyim tswvyim ua ke. Muaj ib zaug uas muaj ib zaj uas tshwm nrhiav tau tswvyim yog phau Post Tension Metal Corrugated Duct Making Machine. Tej zaj no pab tau ntaus phau ntawv phoojywg phau nrhiav nrhiav phau ntawv phauj