基金Supported by by National Natural Science Foundation of China(11071053)the Natural Science Foundation of Hebei Province(A2010001482)the Key Project of Science and Research of Hebei Education Department(ZH2012080)
基金Supported by the National Natural Science Foundation of China(11071053)the Natural Science Foundation of Hebei Province(A2010001482)the Project of Science and Research of Hebei Education Department(the second round in 2010)