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(1)_副本_1760321095013.jpg "structure bracing")
_副本_1758525665999.jpg "steel frame structures")
_副本_1762324991500.jpg "steel beam construction")
_副本_1762408623604.jpg "splicing details for steel beam")
_副本_1762409363712.jpg "steel truss structure")
_副本_1762409946480.jpg "steel column design")
