什么叫动不平衡？
参考答案：旋转件在径向位置有偏重（或相互抵消）而在轴向位置上两个偏重相隔一定距离造成旋转不平衡，叫动不平衡。
Bad luck! ________ I want to see that terrible big dog, ________ frequently I meet it. [ ]
A. The less; the less
B. The more; the more
C. The less; the more
D. The more; the less
为了确保对物流服务进行定量控制和评估，物流标准要表达清楚，具有量化指标。
