跨距MM型號扁鋼尺寸MM橫桿間距MM橫桿尺寸MM自重KG㎡30045060075090010501200135015001650180019502100225024002550270028503000U163010551572750017600122228979687554324400363630552446186514151093858682550448W60540100100720D035060098153221301339497641743884...
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