JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 1995, Vol. 19 ›› Issue (01): 41-45.doi: 10.3969/j.jssn.1000-2006.1995.01.008
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Sun Kunlong;Wang Weimin(College of Mechanical Engineering Nanjing Forestry University Nanjing 210037)Gen Gang;Cheng Zhengang