《英汉电力技术词典（第二版）》共收词汇12万多条，内容覆盖电工电子、电力系统、火电、水电、核电、新能源、输配电、计算机与仪表控制、金属材料、化学、环保等与电力工业相关的专业学科。 本词典主要供从事电力科研、设计、施工、运行和电力设备制造、修理的工程技术人员、管理人员使用，也可供有关院校师生使用。
《示性类》内容简介：The text which follows is based mostly on lectures at PrincetonUniversity in 1957. The senior author wishes to apologize for the delayin publication.The theory of characteristic classes began in the year 1935 with almostsimultaneous work by HASSLER WHITNEY in the United States andEDUARD STIEFEL in Switzerland. StiefeI's thesis, written under thedirection of Heinz Hopf, introduced and studied certain "characteristic"homology classes determined by the tangent bundle of a smooth manifold.Whitney, then at Harvard University, treated the case of an arbitrary spherebundle. Somewhat later he invented the language of cohomology theory,hence the concept of a characteristic cohomology class, and proved thebasic product theorem.
