Warning: file_put_contents(/home/ksfyjmpk7sufyytjcm/wwwroot/source/cache/license_cache.php): failed to open stream: Permission denied in /home/ksfyjmpk7sufyytjcm/wwwroot/source/model/api.class.php on line 217
是指圆度跳动等精度要求较高的轴件,有些又称精密轴芯.往往是非标零件,依据顾客样件或图纸要求定制加工
