He had persuaded his science teacher to help him make a makeshift rocket. Somehow, he had managed to get his hands on the ingredients for gunpowder - potassium nitrate, sulphur and charcoal.
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Author(s): Xichuan Liao, Haipan Xiang, Rongyang Qiu, Yangchun Chen, Yong Liu, Ning Gao, Fei Gao, Wangyu Hu, Huiqiu Deng。业内人士推荐服务器推荐作为进阶阅读
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第三十五条 国家对放射源、射线装置实行分类管理，具体分类办法由国务院有关部门制定。