http://reply.papertrans.cn/2/134/13315/13315-21.png
Submitted on: 20 December 2020.
Revised on: 15 April 2021.
Accepted on: 10 June 2021.
___________________INTERNATIONAL JOURNAL OF EDUCATIONAL DEVELOPMENT
Submitted on: 07 September 2000.
Revised on: 18 October 2000.
Accepted on: 29 November 2000.
___________________INTERNATIONAL JOURNAL OF EDUCATIONAL DEVELOPMENT
Submitted on: 16 March 2007.
Revised on: 05 June 2007.
Accepted on: 13 July 2007.
___________________INTERNATIONAL JOURNAL OF EDUCATIONAL DEVELOPMENT
http://reply.papertrans.cn/2/134/13315/13315-25.png
http://reply.papertrans.cn/2/134/13315/13315-26.png
http://reply.papertrans.cn/2/134/13315/13315-27.png
http://reply.papertrans.cn/2/134/13315/13315-28.png
http://reply.papertrans.cn/2/134/13315/13315-29.png
http://reply.papertrans.cn/2/134/13315/13315-30.png