基金Project supported by the National Natural Science Foundation of China(No.20490200)the National Key Technology R&D Program of China(Nos.85-516-06-03,2001BA305B03,and 2007BAF22B08)+1 种基金the National High-Tech R&D Program(863 Program)of China(No.2007AA04Z182)the SINOPEC Technology Project(No.406005),China