The artical introduced experiment that made DOTP Plasticizer with waste polyester directly.
本文介绍了废聚酯采用直接法制取增塑剂对苯二甲酸二异辛酯（DOTP）的研究。
The artical attempts to advance some professional concepts a physical education teacher in the 21st century should have.
探讨了21世纪体育教师应具有的职业观念，指出了正确的职业观念直接关系到体育教学目的的实现。
The artical analyses the stability of the bicycle from both the motion of mass-center and the gyroscopic action of bicycles.
本文分别从质心运动和车轮的回转效应来分析自行车的稳定性。
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