JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 1995, Vol. 19 ›› Issue (01): 81-84.doi: 10.3969/j.jssn.1000-2006.1995.01.017
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Shi Yumin(Xu Zhou Ecenomic Managenent Cadre’s College of Jiangsu Province Xuzhou 221000)Lu Huaimin