“虚短”是指在理想情况下，两个输入端的电位相等，就好像两个输入端短接在一起，但事实上并没有短接，称为“虚短”。虚短的必要条件是运放引入深度负反馈。 “虚断”指在理想情况下，流入集成运算放大器输入端电流为零。这是由于理想运算放大器的输入电阻无限大，就好像运放两个输入端之间开路，但事实上并没有开路，称为“虚断”。 “虚地”是深度电压并联负反馈放大器的重要特点，是指集成运放的反相输入端为虚地点，即u_=0。
双语例句原声例句
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本文从地与虚地的概念入手，浅议了地与虚地的关系，并列举了虚地的实际运用。
This essay begins with the definition of Ground and virtual Ground, and then discusses emphatically the relation between them. Furthermore, it enumerates concrete practical use of the virtual Ground.
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虚函数简单地向标准输出写一行文本。
The virtual functions simply write a line of text to standard output.
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Rhino代码读起来很像C程序：它避免过多的分配，并且尽量多地使用跳转表（Jump Tables）来避免虚方法查询（Virtual Method Lookups）的额外开支。
The Rhino code base reads almost like C code: it avoids allocation and does as much as possible with jump tables to avoid the overhead of virtual method lookups.
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Now in order to illustrate the way in which what Iser calls virtual work gets done in this regard, let me just run through a few passages quickly.
现在，为了阐释,在这点上，伊瑟尔所说的虚功是怎样做的，下面我们来快速地浏览几段话。
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- 来自原声例句