This article is from the The Terminator FAQ, by Karsten A. Loepelmann firstname.lastname@example.org with numerous contributions by others.
Yes, if you look carefully when it is reloading after it flies beneath the
overpass. Although the T-1000 is supposed to "mimic" shapes it comes in
contact with, this seems to be an acceptable modification of its shape. Note
that in the fight scene at the end of T2, the T-1000 is clearly capable of
modifying its humanoid appearance--not to mention the many other myriad
(partial) transformations, like "knives and stabbing weapons."