PROTHPS-3060DH-1平面磨床操作 

学习了，只是机械爱好者。正在学习基础知识。

谢谢

Very good and helpful video clip. I have just come to Taiwan, Taipei working in Engineering like this. Thank you. I learned a lot

是什么手机，对焦这么差，我以后都不买。

2:42不是開機之後就要重修嗎