20.如图所示为电子射线管阴极k�射电子阳极p和阴极k间加上电压后电子被加速ab是偏�板使飞进的电子偏离若已知pk间所加电压 Template




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tomski20.如图所示为电子射线管阴极k�射电子阳极p和阴极k间加上电压后电子被加速ab是偏�板使飞进的电子偏离若已知pk间所加电压 coloring