A hybrid powertrain includes an electrically variable transmission and an internal combustion engine. An actuation member is mounted for rotation about a rotation axis that is parallel to the longitudinal axis. One end of the adsorption pipe is detachably connected with the base component and, the other end of the adsorption pipe is detachably connected with the top cover component, a locking component used for compressing the adsorption pipes is arranged between the base component and the top cover component. The display also includes a switching unit configured to transmit the third and fourth power voltages to the pixel power source line when the first and second power voltages are off. Then the rollers are rotated and moved laterally right and left by one of the wheels so that sand grinding of the rollers rotating and moving laterally right and left at the same time can grind a work being ground smooth and glossy.