中国核建：公司可控核聚变相关业务占比极低。

Group 1 - The core viewpoint of the article is that the controllable nuclear fusion-related business of the company accounts for a very low proportion of its overall operations [1] Group 2 - The company is primarily focused on other areas, with nuclear fusion being a minor segment of its business strategy [1] - There is an emphasis on the limited impact of nuclear fusion on the company's financial performance and growth prospects [1]