http://reply.papertrans.cn/2/125/12449/12449-31.png
http://reply.papertrans.cn/2/125/12449/12449-32.png
http://reply.papertrans.cn/2/125/12449/12449-33.png
http://reply.papertrans.cn/2/125/12449/12449-34.png
Submitted on: 26 November 2018.
Revised on: 05 January 2019.
Accepted on: 06 February 2019.
___________________INDUSTRIAL AND COMMERCIAL TRAINING
http://reply.papertrans.cn/2/125/12449/12449-36.png