One type is the iconoscope . it contains three essential parts - - a mosaic , a collector ring and an electron gun.
一种是光电摄象管，它有三个基本部件- -嵌镶光电阳极、集电环和电子枪。
The visible telephone and visible doorbell have wide application and bright prospects. The electron gun is one of the key components of the picture tube for visible systems.
可视电话、可视门铃具有广阔的发展前景，其显像管电子枪属于关键部件。
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