GB 40881-2021煤礦低濃度瓦斯管道輸送安全保障系統設計規范Code for security system design of low concentration gas pipeline transportation of coal mine

上一條：GB/T 40927-2021皮革 物理和機械試驗 漆皮耐熱性能的測定Leather. Physical and mechanical tests. Determination of heat resistance of patent leather

下一條：GB/T 1232.3-2021未硫化橡膠 用圓盤(pán)剪切黏度計進(jìn)行測定 第3部分：無(wú)填料的充油乳液聚合型苯乙烯-丁二烯橡膠Delta門(mén)尼值的測定Rubber, unvulcanized—Determinations using a shearing-disc viscometer—Part 3:Determination of the Delta Mooney value for non-pigmented, oil-extended emulsion-polymerized SBR

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