%0 Journal Article %T ũҩɱ³æëßµÄÖ°©ÐÔÆÀ¶¨ %A ѦÊÙÕ÷ %A ÍôÃô %A Àî·ã %A ÕÅÈðÎÈ %A ½¯Ñ§Ö® %A ÍõºmÀ¼ %J °©±ä¡¤»û±ä¡¤Í»±ä %D 1989 %U http://www.egh.net.cn/CN/abstract/abstract913.shtml