  We show that R-matricies of all simple quantum groups have the properties
which permit to present quantum group twists as transitions to other coordinate
frames on quantum spaces. This implies physical equivalence of field theories
invariant with respect to q-groups (considered as q-deformed space-time groups
of transformations) connected with each other by the twists. Taking into
account this freedom we study quantum spaces of the special type: with
commuting coordinates but with q-deformed differential calculus and construct
$GL_r(N)$ invariant multidimensional Jackson derivatives. We consider a
particle and field theory on a two-dimensional q-space of this kind and come to
the conclusion that only one (time-like) coordinate proved to be discretized.
