【A-share Afternoon Review: Shanghai Index Falls 0.72%, Copper Cable High-Speed Connection Concept Rises Against the Trend】Jin10 Data December 19th, today's three major indices opened lower collectively and then maintained a fluctuating trend. By the close of the midday session, the Shanghai Index fell 0.72%, the Shenzhen Component Index fell 0.33%, and the ChiNext Index fell 0.36%. On the market, the copper cable high-speed connection concept rose against the trend, with Huamai Technology, Derun Electronics, and Xinke Materials hitting the daily limit. The liquid cooling server concept fluctuated and rose, with Haolan Co., Ruijie Networks, Kangsheng Co., Jialitu, and Guangxun Technology hitting the daily limit. The computing power leasing concept was active, with Aoya Co., Nanling Technology, and Runjian Co. hitting the daily limit. The brain engineering concept peaked and then retraced, while the robotics concept showed partial warming. The commercial chain, liquor, public transportation, coal, seed industry, and short drama game sectors saw significant declines. Most individual stocks fell, with over 4,100 stocks in the Shanghai and Shenzhen markets declining. (Source: Jin10 Data)