Resources & Industries ›› 2008, Vol. 10 ›› Issue (6): 108-111.
• STUDY ON PROBLEMS • Previous Articles Next Articles
TIAN Bao-zhu, LI Chang-cun, TAN Jing
(Teaching Office, Hebei University of Science and Technology, Tangshan 063009)
(河北理工大学 教务处,河北 唐山 063009)