... buttresswaterpowerstation支墩式水力发电厂 bridgeboard楼梯帮 boomangle起重机吊杆的斜角度 ...
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... bridgeable可架桥的 bridgeboard楼梯侧板 bridgebuilder调解人 ...
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... 梁 beam 楼梯梁 bridge board; bridgeboard; stair stringer; stringpiece 槽钢楼梯梁 channel stringer ...
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bridgeboard E 楼梯帮
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N a board on both sides of a staircase that is cut to support the treads and risers 楼梯侧板 (Also called cut string)
check of staircase
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