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vacuum electronic device
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vacuum electronic device
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真空电子器件
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vacuum electronic device
真空电子器件
借助电子在真空或气体中与电磁场发生相互作用,将一种形式电磁能量转换为另一种形式电磁能量的器件。
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Pearson method
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pearson type distribution
Pearson type Ⅲ distribution
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peasant
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peasant economy
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