In practice ,a rotor weighing about 10 tons and rotating at 3,000 r .p .m. may be so well balanced that the motion ,except for sound ,is just perceptible.

 
  • 实际上,一根据重约10吨、每分钟3000转的转子可以平衡得非常好,以致除了响声外,人们几乎觉察不出它是在转动。
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