Things being tighter these days, so I think you 'd better apply in your country for the embassy in Bangkok may require more documents but get less chance to obtain a visa. Except for the basic requirements like a passport, a photo, one application form and their copies, a multiple entries business visa requires:
1. The original Visa Notice Sheet from an authorized organization in China (prescribing the visa validity, times of entry and stay period);
2. For investment in China, there is a need for the original business license in China attached with the name of the applicant and the corresponding photocopies (the original will be returned to the applicant after check);
3. The applicants who are the managing personnel of the foreign companies which have already had branches in China need to provide the company's visa application letter and the invitation letter from the branches in China.
4. If there are twice or more than twice visit to China with "F" visa before the application, the photocopies of "F" visa and the invitation letter from Chinese companies or enterprises are required.

I think it is not easy to apply for a-year f visa. May be you can apply a 3 month visa, we can send you the business invitation letter. However you just can stay in China for 30 days, then you should do the Extension or going abroad.