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 test the rotation strength of grinding wheel and is equipped with LCD digital tachometer to display the instant speed.
When the operator presses the button, the host machine can run according to the preset speed control curve, and automatically complete the functions of acceleration, delay, deceleration, and stop, etc., with the function of safety lockout protection.