This paper analyses the basic formula of valence-shell electronic repulsion theory and discuses the laws of the geometry configuration of molecule.
本文阐述了价电子对互斥理论的基本要点和判断分子空间构型的规则；
Basic essential information such as the shell, files and directories, text processing, process management, editing and typesetting, and electronic mail.
必备的基础知识，如shell、文件和目录、文本处理、进程管理、编辑排版和电子邮件。
Shell and tube heat exchanger, screw compressor, and electronic expansion valves are detailed selectioned and designed, and a sewage-source heat pump system is designed for a building of Harbin.
对壳管式换热器、螺杆压缩机、电子膨胀阀进行详细的选型和设计计算，对哈尔滨市某办公楼设计出一套污水源热泵系统。
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