GB/T 33640-2017齿轮齿条式人货两用施工升降机安装质量检验规程国家标准
英文:Installation quality inspection code of rack and pinion hoists for persons and materials GB/T 33640-2017介绍: 国家标准《齿轮齿条...
英文:Installation quality inspection code of rack and pinion hoists for persons and materials GB/T 33640-2017介绍: 国家标准《齿轮齿条...