| 释义 |
电子管diànzǐguǎn无线电技术上的重要器件。在玻璃或金属的容器内装特制的电极,通过阴极放射的电子与其他电极相作用进行各种工作,最重要的作用是整流、检波、放大和振荡。简单的电子管有两个极,叫二极管。按电极数可分为三极管、四极管、五极管等。一般常用的都是高度真空的,所以也叫真空管。{electron tube; valve; important device in radio engineering, in which two or more electrodes are enclosed in an envelope of glass or metal, and the electrons provided by the emission of one negative electrode interact with the other electrodes, the most important reactions being rectification, detection, amplification, and oscillation. A simple electron tube with two electrodes is called a diode or two-electrode valve. There are also triode, tetrode, pentode, and so on, according to the number of electrodes. An electron tube is usu. evacuated, so it is also called a vacuum tube.} |