基极中空穴的密度小于发射极和集电极中自由电子的密度。
The density of holes in the base is less than the density of free electrons in the emitter and collector .
基极总是比发射极和集电极薄得多。
The base region is always very much narrower than the emitter or collector regions .
截止频率是影响共发射极、共基极和共集电极电路频率特性的重要因素。
Cut off frequency is the main factor influencing frequency properties of electrode circuits of common emitter, common base and common collector.
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