欧美性zoo_夜夜摸日日操_大胆顶级欧美aaa级_经典av三级_成人视屏在线_一级 黄 色 片69

This machine is mainly used to detect the rotation strength of the grinding wheel, and is equipped with a liquid crystal digital tachometer to display the instantaneous speed.

When the operator presses the button, the host can operate according to the preset speed control curve, and automatically complete the functions of acceleration, delay, speed reduction, stop, etc., and has a safety lock protection function.