[A-shares Open, C Changxin Opens Over 10% Higher] Shenchao TechFlow reports that on July 31, A-shares opened with the Shanghai Composite Index up 0.76%, the Shenzhen Component Index up 3.04%, the ChiNext Index up 5.15%, and the STAR 50 Index up 8.37%; C Changxin opened over 10% higher. (Jin10)