前言 1980年11月至1982年12月,陈国邦同志应邀以访问学者的身份,在美国国家标准局波尔德研究所进行了有关低温工程的研究工作。现将访问期间了解的一些情况及有关资料,整理成文,以供参考。为了了解美国国家标准局的概况,首先扼要介绍美国国家标准局的发展简史和主要 Preface From November 1980 to December 1982, Comrade Chen Guobang was invited as a visiting scholar to conduct a research project on cryogenic engineering at the National Bureau of Standards Institution’s Polder Institute. Now I know some of the information we have learned during the visit and organize them for reference. In order to understand the general situation of the National Bureau of Standards of the United States, the first brief outline of the history of the development of the United States National Bureau of Standards and the main