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microwave electronic tube
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microwave electronic tube
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工学
真空电子器件
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microwave electronic tube
微波电子管
工作于微波波段的微波真空电子器件。简称微波管。
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economic function of green space
economic functions of the socialist state
economic geography and public policy
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Economic Geography: the Integration of Regions and Nations
economic globalization
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Economic Growth and Agriculture
economic growth factor
economic growth theory
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economic impacts of the port
economic incentive instruments
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Economic Information Daily
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