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出电子。在灯管两侧加上比较高的电压，形成电场，这些电子就会在灯管里被加速，形成有一定速度和能量的电子流。灯管是被抽成真空的，里面充有汞，就是我们称为的水银。在灯管通电发热的情况下，这
http://blog.alighting.cn/135603/archive/2012/7/17/282167.html2012/7/17 11:31:23
