JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 1997, Vol. 21 ›› Issue (S1): 232-235.doi: 10.3969/j.jssn.1000-2006.1997.07.058
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Hu Songtao Li Xuquan(Department of Environmental Engineering Qingdao College of Architectural Engineering Qingdao 266033)Lian Leming