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10070%4-85120101JournalofChangchunUniversityofScienceandTechnologyHigherEducationEditionVol.5No.1Jun.2010G647A19782500011012450150024682470%50%0.30m210.55m37/min43/min1(GBJ16-87)S.2001.2(GB50045-95)S.2001.3(GB50084-2001)S.2001.4.M.1999.