烟花爆竹的安全首先取决于烟火药剂配方的科学合理与满足环保安全的要求。
The safety of fireworks and firecrackers lies on scientific and rational pyrotechnic compositions and satisfaction to the requirements of environmental protection and safety firstly.
烟花爆竹的安全首先取决于烟火药剂配方的科学合理与满足环保安全的要求。
The safety of fireworks and firecrackers lies on scientific and rational pyrotechnic compositions and satisfaction to the requirements of environmental protection and safety firstly.
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