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national measurement primary standard
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national measurement primary standard
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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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blasting damage
blasting damage of rock mass
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blasting for exploratory adits,shafts and trenches
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