ICS43.040.40CCSQ69中华人民共和国国家标准GB/T5766—2023代替GB/T5766—2007摩擦材料洛氏硬度试验方法TestmethodofRockwellhardnessforfri...
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ICS29.120.20K14中华人民共和国国家标准GB/T5586—2016代替GB/T5586—1998电触头材料基本性能试验方法Testmethodsforessentialpropertyofel...
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2025生物基材料产业发展报告（含绿色替代）摘要：本报告立足2025年全球“双碳”目标深化推进的宏观背景，系统梳理生物基材料产业的发展态势...
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ICS17.240F74中华人民共和国国家标准GB/T30142—2013平面型电磁屏蔽材料屏蔽效能测量方法Measuringmethodsforshieldingeffectivenessofplan...
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