Most of the assets used by Adobe Muse end with a crc
GET parameter.
For example:
site_global.css?crc=496117513
This is valid for all imagery, css and javascript files.
I am wondering why they used it and could it be removed?
That probably stands for Cyclic Redundancy Check, a simple checksum.
It's probably used for cache-busting, to make sure that the URL changes if the content changes.