Breakdown of La bibliothèque a une salle d’informatique et un laboratoire de physique.
Questions & Answers about La bibliothèque a une salle d’informatique et un laboratoire de physique.
The verb avoir (here: a) is used to express possession: the library has these rooms.
You could also say:
But La bibliothèque est une salle d’informatique would mean the library is a computer room, which is wrong here: the library is not identical to the room; it just possesses it.