用托盘天平测量�属块的质量时应先把天平放在水平 桌面上然后将游码移到标尺的 位置上�现横梁指针如图此时应将平衡螺母� 调使天平平衡 Template




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tomski用托盘天平测量�属块的质量时应先把天平放在水平 桌面上然后将游码移到标尺的 位置上�现横梁指针如图此时应将平衡螺母� coloring