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图示为一种相当适用的V型装置。其原理为:用标准的螺旋式千斤顶将普通V型块换成由四个滚珠轴承,按图示排列组成V型,零件安放在该装置上后不
The figure shows a fairly suitable V-shaped device. The principle is: with a standard screw jack ordinary V-block replaced by four ball bearings, arranged in the form of V-shaped diagram, the parts placed on the device after not