24.如图所示是显像管电子束运动的示意图电子枪�出的电子要先经过加速电场加速再经过偏转磁场的偏转最后射到荧光屏上设加速电场两板间的电压 Template




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tomski24.如图所示是显像管电子束运动的示意图电子枪�出的电子要先经过加速电场加速再经过偏转磁场的偏转最后射到荧光屏上设加速电场两板间的电压 coloring