国家重点基础研究发展规划(批准号:2001CB610503)和国家自然科学基金(批准号:90101020,90301009,10174035)资助项目 Project supported by the State Key Development Program for Basic Research of China(No. 2001CB610503) and the National Natural Science Foundation of China(Nos.90101020,90301009,10174035)