The fundamental constants being constant is an assumption.

基本常数不变仅是一个假设。

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Fundamental physical constants By the US National Institute of Standards and Technology.

物理基础常数，由美国国家标准和技术会提供。

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Fundamental physical constants By the US National Institute of Standards and Technology.

物理基础常数，由美国国家标准和技术会提供。

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