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自然基准
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自然基准
由反映物质运动自然规律的基本物理常数导出的电学基准或电学标准。
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vacuum arc
vacuum arc degassing
vacuum arc furnace
vacuum arc remelting
vacuum arc smelting of titanium
vacuum arrester
vacuum bag-molding
vacuum baking
vacuum behavior of livestock
vacuum bell jar
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vacuum breakdown
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vacuum carburizing technology
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