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国家测量基准
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国家测量基准
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国家测量基准
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national measurement primary standard
国家测量基准
为了定义、实现、保存或复现量的单位或一个或多个量值,用作参考的实物量具、测量仪器、标准物质或测量系统。又称国家计量基准或国家基准。
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teacher learning
teacher made test
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teacher normal school in tongzhou
teacher of ideological and political theory courses in colleges and universities
teacher online professional learning and development
teacher paid by the local people
teacher professional development
teacher professional development institution
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