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1982年7月,北方交通大学孙桂初教授在青岛铁道车辆技术政策座谈会上,就铁路保温车的技术政策作了大会发言,下面发表的是他的发言要点。
In July 1982, Professor Sun Guichu of North Jiaotong University made a speech at the symposium on the technology policy of railway vehicles in Qingdao on the technical policy of railway car insulation. The following is the keynote address of his speech.