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我厂生产的QY8型汽车起重机中,操纵阀体加工一直是个薄弱环节。特别是内孔七槽,孔小而长(见图1),槽距尺寸精度要求较
I plant QY8-type truck crane, the control valve body processing has been a weak link. In particular, the seven holes in the hole, the hole is small and long (see Figure 1), slot spacing accuracy requirements