基金Supported by the National Natural Science Foundation of China under Grant Nos.60473064 60773152 (国家自然科学基金)+2 种基金the National High-Tech Research and Development Plan of China under Grant No.2007AA01Z127 (国家高技术研究发展计划(863))the National Basic Research Program of China under Grant No.2005CB321805 (国家重点基础研究发展计划(973))the Key Technologies R&D Program of China under Grant No.2003BA904B02 (国家科技攻关计划)