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national measurement primary standard
释义
national measurement primary standard
Encyclopedia
工学
国家测量基准
释
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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Philosophy of Logical Atomism
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philosophy of mind
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philosophy of nature
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Philostratos Flavius
Philps
philtrum
phi meson
phimosis
pH indicator
Phineas T.Barnum
phi-number system
phi-prime
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