JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 1994, Vol. 18 ›› Issue (04): 63-67.doi: 10.3969/j.jssn.1000-2006.1994.04.012
Previous Articles Next Articles
Yang Dehua(College of Mechanical Engineering Nanjing Forestry University Nanjing 210037)Ruan Xigen