歌唱音准问题研究
study on singing intonation
汽车被动安全性研究
research on vehicle passive safety
路侧安全改善
roadside safety improvement
随机抽题算法-Josephus算法
algorithmic of setting examination questions at random the method of Josephus
北京师范大学中国农民问题研究中心
China’s Peasantry Issues Center
beijing normal university
财经问题研究
Research on Financial and Economic Issues
弹性杆系问题研究
A Study on the Elastic Bar System Problem
反应器安全研究
Alpinia officinarum Hance
改性研究
research on mo dification
Study of modification
Research on Promotion
modification
study on Modification
modification research