2B pencil. The national unity requires that the special pens for college entrance examination in all provinces be 2B pencils, and using other pencils is considered cheating. Guizhou, referred to as "Guizhou" or "Guangxi" for short, is the provincial administrative region of China people. Located in the hinterland of southwest China. It is a transportation hub in the southwest of China and an important part of the Yangtze River Economic Belt. China's first national big data comprehensive experimental zone.