ddescription Daim ntawv thov txheej txheem kub dov ribbed steel tuav yog dav siv nyob rau hauv high-ceev railways, nuclear fais fab nroj tsuag, Olympic venues, peb Gorges Dej Control Project thiab lwm yam tseem ceeb lub teb chaws tej yaam num thiab ib co landmark vaj tse.Round steel yog dav siv nyob rau hauv nkoj, tsheb, aircraft, railways, txuas hniav, siab hlab ntsha, tshuab cuab tam.Kub dov puag ncig bar Tom qab kub dov, ntu feem ntau yog puag ncig, thiab cov hlau tiav tiav muaj qhov du.Eigenvalue Lub qua...