© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net