The vacuum electronic device plays a very important role in the military affairs and demotic message system and the daily life of the people.
在军事和民用信息系统及人民日常生活中，真空电子器件发挥着重要的作用。
The vacuum electronic device plays a very important role in the military affairs and demotic message system and the daily life of the people.
在军事和民用信息系统及人民日常生活中，真空电子器件发挥着重要的作用。
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