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The scale dependence of the ratios of parton distributions in a proton of anucleus $A$ and in the free proton, $R_i^A(x,Q^2)=f_{i/A}(x,Q^2)/f_i(x,Q^2)$,is studied within the framework of the lowest order leading-twist DGLAPevolution. By evolving the initial nuclear distributions obtained with theGRV-LO and CTEQ4L sets at a scale $Q_0^2$, we show that the ratios$R_i^A(x,Q^2)$ are only moderately sensitive to the choice of a specific modernset of free parton distributions. We propose that to a good firstapproximation, this parton distribution set-dependence of the nuclear ratios$R_i^A(x,Q^2)$ can be neglected in practical applications. With this result, weoffer a numerical parametrization of $R_i^A(x,Q^2)$ for all parton flavours $i$in any $A>2$, and at any $10^{-6}\le x \le 1$ and any $Q^2\ge 2.25$ GeV$^2$ forcomputing cross sections of hard processes in nuclear collisions.Comment: 14 pages, including 4 eps-figure

The scale dependent nuclear effects in parton distributions for practical applications