- 1. Tube tetrode with directly or indirectly heated cathode.
- 具有直接或间接加热的阴极的电子管四极管。
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- 2. Reverse blocking tetrode thyristor; semiconductor controlled switch.
- 反向阻断四极型可控硅、半导体控制开关。
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- 3. Technical improvement of making rotary tube furnace, tetrode reduction furnace in recent years is described.
- 介绍了近年来在制作回转管炉、四管还原炉的技术进步；
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- 4. Technical improvement of making rotary tube furnace, tetrode reduction furnace in recent years is described.
- 介绍了近年来在制作回转管炉、四管还原炉的技术进步；
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