国产丝袜极品视频在线观看_午夜精品一区二区成人免费_色偷偷亚洲男人天堂岛_亚洲AV自慰白浆喷水肥臀_中文在线理伦视频在线播放

　　March 25, Professor Dong Runzhen, Industrial and Systems Engineering Department, National University of Singapore, visited SME and made a presentation entitled "Challenges facing Management Science / Operations Research / Industrial Engineering education and research: Singapore experience ". Professor Rong Cuili,  Professor Zhang Xiang and some students participated in the lecture. Professor Wang Zhaohua Assistant Dean, presided over the meeting.