如图是示波管的原理图它由电子枪偏转电极荧光屏组成管内抽成真空.给电子枪通电后如果在偏转电极xx′和yy′上都没有加电压电子束将打在 Template




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tomski如图是示波管的原理图它由电子枪偏转电极荧光屏组成管内抽成真空.给电子枪通电后如果在偏转电极xx′和yy′上都没有加电压电子束将打在 coloring