Lub qhov rooj nrawm nrawm muaj qee yam kev tiv thaiv tub sab nyiag, tab sis qhov kev kawm tshwj xeeb nyob ntawm cov khoom siv, kev tsim qauv thiab kev nyab xeeb ntawm lub qhov rooj. Ua ntej tshaj plaws, qhov rooj nrawm nrawm feem ntau yog ua los ntawm cov khoom siv hlau muaj zog, xws li aluminium alloy, stainless hlau, thiab lwm yam, uas muaj ...
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