Planks踏板测试要求 scaffold planks 踏板的测试要求 Safety Requirements for Scaffolding—American National Standard for Construction and Demolition Operations 脚手架安全要求...
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... scaffold planks 脚手板，跳板 bearer 小横杆 longituadinal bracing 纵向斜撑 ...
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Fabricated Scaffold Planks and Stages 预制脚手架厚板材和阶梯
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