BS EN 81-31. Safety rules for the construction and installation of lifts. Lifts for the transport of goods only. Part 31. Accessible goods only lifts
英国标准81-31 电梯施工和安装的安全规则 电梯仅用于运输货物 第31部分 无障碍货物专用升降机
发布日期:
2006-05-30
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