The essential prerequisite for using lever scale is that its maker knew the principle well.
不等臂天平的出现，其前提条件是制造者对杠杆原理的掌握。
Electronic scale weighing instrument, belonging to a, is the use of Hooke's law or the force of the lever balance principle to measure quality tools.
电子秤，属于衡器的一种，是利用胡克定律或力的杠杆平衡原理测定物体质量的工具。
Electronic scale weighing instrument, belonging to a, is the use of Hooke's law or the force of the lever balance principle to measure quality tools.
电子秤，属于衡器的一种，是利用胡克定律或力的杠杆平衡原理测定物体质量的工具。
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