ORIGINAL: Orm
No, China has yet to build any artillery. Although it is planned to do so.
However, the current Chinese production is only 5 BPs. And PM is currently at 0.75, unless Japan attacks and then it increase to 1.
However, the production multiple will increase to 1 J/F, which is not too far away, so it makes sense to repair the factory. Getting units J/F usually doesn't help all that much, as it is likely they won't be able to move. So repair the factory, and build the ART later. (But soon.)