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GB/T 35465.5-2020
Test method for fatigue properties of polymer matrix composite materials—Part 5: Flexural fatigue
GB/T 35465.4-2020
聚合物基复合材料疲劳性能测试方法 第4部分:拉-压和压-压疲劳
Test method for fatigue properties of polymer matrix composite materials—Part 4: Tension-compression fatigue and compression-compression fatigue
GB/T 39538-2020
Determination of arsenic, selenium and mercury in coal—Hydride generation-atomic fluorescence spectrometry
GB/T 39539-2020
Technical requirements for determination of gas diffusion coefficient in shale reservoir
GB/T 39540-2020
Fast determination of shale gas composition—Laser Raman spectroscopy
GB/T 39501-2020
Sensory analysis—Guidelines for the use of quantitative response scales





