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初中物理第一册p.23有:“……横梁平衡为止。这时盘里砝码的总质量加上游码所对应的刻度值,就等于被测物体的质量。”这里游码和砝码一般不在横梁的同一位置,因此有必要就天平使用的几种情况说明天
Junior High School Physics Book 1 p.23 has: “... beam balance until now. The total weight of the plate weight plus the scale value corresponding to the ride code is equal to the quality of the object being measured.” Generally not in the same position of the beam, so it is necessary to explain the days of use of the balance.