Department of City Construction, Taiyuan City Vocational College,
Taiyuan 030027, Shanxi, PR China
Submission date: 2016-11-22
Final revision date: 2017-03-23
Acceptance date: 2017-03-28
Online publication date: 2017-08-28
Publication date: 2017-09-28
Pol. J. Environ. Stud. 2017;26(5):2355–2361