基金Supported by the National Key Technology R&D Program of China under Grant No.2006BAH02A01(国家科技支撑计划)the National Natural Science Foundation of China under Grant Nos.60603025+2 种基金60503018(国家自然科学基金)the National High-Tech Research and Development Plan of China under Grant No.2006AA01Z171(国家高技术研究发展计划(863))the Natural Science Foundation of Zhejiang Province of China under Grant No.Y105463(浙江省自然科学基金)