This work was supported by the Natural Scientific Research Foundation of Guizhou Provincial Education Department(2008072);the Natural Science Foundation of Science and Technology Bureau of Bijie Area(2008-06)~~
Supported by the Natural Science Research Foundation of Guizhou Provincial Education Department (2008072);the Natural Science Foundation of Science and Technology Bureau of Bijie Area(2008-06)
Supported by the Scientific Research Foundation of Science and Technologe Bureau of Bijie Prefecture of Guizhou Province(2008-06) ;the Scientific Research Foundation of Bijie University(20072001)
Supported by NSF of Science and Technologe Bureau of Bijie Prefecture of Guizhou Province and the Scientific Research Foundation of Bijie University(2008-06)