Oringinal Steel purlins, studs, thiab lem ua lub luag haujlwm tseem ceeb hauv kev tsim kho ntawm ntau yam qauv, txawm tias nws yog lub tsev, choj, lossis lwm hom kev ua haujlwm. Cov khoom siv hlau no yog siv rau lawv lub zog, durability, thiab nqi-zoo. Kev tsim cov khoom siv no ...
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