而特征多项式的系数与有向图的圆族有着密切的关系。
And the coefficients of eigen-polynomial expressions were closely related to the circular sets of a directional graph.
立柱的外圆上设有一导 向长槽，在导向长槽的槽底加工有二个分别设置的小凹槽。
The outer circle of the vertical pole is provided with a guiding elongated slot, and the slot base of the guiding elongated slot is processed with two small grooves which are respectively arranged.
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