[texhax] A question about stretchability and shrinkability

[Rodolfo Medina]

Hi all.

Suppose that in a certain place of my text I say something like, e.g.:

 \vskip 25 pt

and I mean exactly 25 pt with no stretchability neither shrinkability.  Will it
be enough to say:

 \vskip 25 pt plus 0 pt minus 0 pt

?  Am I sure this way that plain TeX will shift what follows by exactly 25 pt,
nothing more, nothing less?  Or should I achieve that by some other commands?

Thanks for any help
Rodolfo