steel joists 中文意思是什麼
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Specification for open web steel joists, k - series
空腹鋼擱柵規范. k系列 -
Specification for longspan steel joists, lh - series and deep longspan steel joists, dlh - series
Lh系列長跨度鋼擱柵和dlh系列深長跨度鋼擱柵規范
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