基金Supported by the Research Project of Dongguan Higher Education (200910815252)the Beijing Natural Science Foundation(7102102)the Scientific Research Key Program of Beijing Municipal Commission of Ed-ucation(KZ200810025011)~~
基金Supported by the Beijing Natural Science Foundation (7102102)the Scientific Research Key Pro-gram of Beijing Municipal Commission of Education(KZ200810025011)the Research Project of Dongguan Higher Ed-ucation(200910815252)~~