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常用机械中包含着大量的作旋转运动的零部件,例如各种传动轴、主轴、电动机和汽轮机的转子等,统称为回转体;回转体或旋转体不平衡的产生主要是质心偏心导致的,严格地说,绝对不偏心的旋转体在真实物理世界不存在，因为制造总是有公差的.
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