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

December 5, 2012, in the afternoon, invited by Professor Wei Yiming, Dean of the School of Management and Economics of Beijing Institute of Technology, and Director of the Energy and Environmental Policy Research Center, Professor Dong Runzhen, Head of the Department of Industrial and Systems Engineering of the National University of Singapore, visited the BIT-CEEP and gave an academic report entitled "Productivity Improvement and Management: Is there scope for further research?".