能源行业标准NB资源
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ICS 27.060 J98 中华人民共和国能源行业标准 恒力弹簧支吊架 NBT 470382019 代替NBT470382013 Constant spring support and hanger 2019一11一04发布2020050
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2010 ASME Boiler and Pressure Vessel Code A N I N T E R N A T I O N A L C O D E III Division 1 Subsection NB Class 1 Com
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