啦啦啦精彩视频免费观看在线,丰满大屁股熟女啪播放,暖暖视频在线观看免费最新,亚洲V天堂,无码爽到爆高潮抽搐喷水在线观看,91亚洲国产一区二区

　　On the morning of December 16, 2016, Prof. Zhang Min from the Department of Statistics, Purdue University made an academic visit to Beijing Institute of Technology. During the visit, he gave an academic report and seminar. The seminar was hosted by Professor Zhang Qiang of the School of Management and Economics. Part of the teachers, doctoral students and international students attended the seminar.