CAD软件开发：按A键，曲轴逆时针旋转，带动摇杆和滑块运动；按D键，曲轴顺时针旋转，带动摇杆和滑块运动。-CAD Software Development: Press A button, crankshaft counter-clockwise rotation, driven rocker and the slide movement press D key, crank clockwise rotation, driven rocker and the slide movement.