Steel hluav taws qhov rooj nrog lub zog siab, zoo tiv thaiv hluav taws. Ntau qhov zoo ntawm cov qhov rooj hluav taws steel ua rau lawv nyob hauv kev lag luam loj hauv cov tsev pej xeem. Cov khoom siv hluav taws kub tsis tau ntim rau hauv lub qhov rooj yog ib puag ncig tus phooj ywg thiab tsis muaj kuab paug. Cov txheej txheem kho saum npoo ntawm lub qhov rooj yog hmoov txau los yog PVC zaj duab xis npog, uas yog cov cuab yeej tiv thaiv ib puag ncig zoo.

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