The Unit size of axes when do the plotting



Hi, guys,
When I do the plotting in Maxima, the unit size of X,Y axes are not the same
length. It seems that the unit size of each axis was adjusted by Maxima
automatically.

The result is the curve drawing effect is not the same as the exact effect
of the eal world and distorted.

Is there some option to make the unit size of every axis are the same?