1 year Visa Inquiry

Hi,

Because I am Argentinean, Industrial Engineer from the University of Buenos Aires and I have just finished studying mandarin in China for 2 years. I have some friends in Argentina who own companies that because they usually import products from China they are interested in me staying in China to inspect the goods before sending them to Argentina. Would it be possible to have a 1 year visa for this purpose? What would be the requirements for me to be able to do this?

Regards
Victor