GB/T 39996-2021.Fireworks and firecrackers- -Determination of calorific value of pyrotechnic powder....
GB国家标准
GB国家标准
GB国家标准
GB/T 39996-2021 烟花爆竹烟火药发热量的测定
GB/T 39996-2021.Fireworks and firecrackers-Determination of calorific value of pyrotechnic powder. 1...