牛顿第二定律，动量定理。
物理比例常数，是物理定理、物理定律公式中一个最常见的常数。
Proportional constant of physics is a common constant of physical theorem and physical law.
物理比例常数，是物理定理、物理定律公式中一个最常见的常数。
Proportional constant of physics is a common constant of physical theorem and physical law.
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