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一、怎样简便地鉴别装在轴上的单列向心球轴承的好坏? 二、你知道图2中安装单列向心球轴承的三种方法哪种正确?为什么?
First, how to easily identify the single row of radial ball bearings installed on the shaft is good or bad? Two, you know the installation of single row radial ball bearings in Figure 2 three methods which is correct? Why?