Sandwich vaj huam sib luag yog ib hom kev tsim kho lub laj kab, uas yog siv rau kev tsim kho laj kab, kev kho vaj tse thiab lwm yam kev tiv thaiv.steel guardrail thav duab yog ruaj khov, muaj zog tsis kam, ua tau zoo dua li cov guardrail.Vim lub thav duab yog ua los ntawm ed steel, qhov zoo ...
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