基金Supported by the Youths’Key Projects of Heilongjiang Provincial Education Department(1155G001)he Youth Foundation of Daqing Normal University(09ZQ03)
基金The author is supported by the Fundation of Ability Person of Fuzhou Univcrsity by thegrants(0030824228)the Fundation of Developing Science and Technology of Fuzhou University underthe grants 2003-XQ-21 the Foundation of Fujian Education Bureau