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物理学中每一个物理量都有其确定的含义,概念界定不同,则意义不同,故不同的物理量有着不同的单位.在中学物理“力学单位制”
Every physical quantity in physics has its definite meaning. If the concept is defined differently, then the meaning is different. Therefore, different physical quantities have different units. In the middle school physics “Mechanics unit system”