双汇发展：目前公司产品销售以国内市场为主

Group 1 - The core viewpoint of the article is that Shuanghui Development primarily focuses on domestic market sales, with a relatively small proportion of export revenue [1] Group 2 - The company responded to investor inquiries on September 19, indicating its current sales strategy [1] - The export revenue of the company is minimal compared to its domestic sales [1]