国际纯粹物理与应用物理联合会的代表大会每三年召开一次,进行执委会和下属各专业委员会的换届选举.第20届大会已于1990年9月25日至28日在民主德国德累斯顿(Dresden)举行,来自28个国家和地区物理学会的代表参加了会议.中国物理学会派出杨国祯、王义遒、杜祥琬三人组成代表团参 The Congress of the International Union of Pure Physical and Applied Physics convenes once every three years to conduct the general election of the Executive Committee and its subordinate professional committees The 20th Congress was held in the Democratic Republic of Germany from September 25 to September 28, (Dresden), representatives from 28 countries and regions attended the meeting.Chinese Physics Society sent a delegation composed of Yang Guozhen, Wang Yihuan and Du Xiangtao