exact sequence短语¹⁴⁴⁹⁷²⁺² 基本例句 恰当系列 In this paper, we mainly discuss special F- precover and F- preenvelope on short exact sequence. 本文主要讨论短正合列上特殊的 F-预复盖与 F-预包络。 dictall You should always read this file before starting a FixPak installation in order to understand the exact sequence of steps you should follow. 在开始安装一个修复包之前，应该阅读这个文件，以便理解应该遵循的步骤的顺序。 ibm