Can SriLankan,with non imig. multip.entry Thai visa, get single entry china visa from Bangkok office

I am a Sri Lankan passport holder, came to Bangkok on 6th Oct for a 6 months consultancy with Asian Disaster Preparedness center. I have multiple entry Thai visa valid till 5th Jan. 2013, which will be further extended till 5th April 2013.
I was invited to attend a two day International workshop on Bio Gas conducted in Chengdu China during 20th- 22nd Nov. Travel lodging and other expenses associated with this workshop will be met by the organizers. Since I am now in Bangkok I look forward to get it to China from Bangkok consulate office. Please inform me weather I can send my application to Chinese Embassy in Bangkok.