Market Overview - The Shanghai Composite Index experienced a narrow fluctuation, closing down 0.12% at 3635.13 points, while the Shenzhen Component Index and the ChiNext Index also declined by 0.26% and 0.38% respectively [1] - The total trading volume in the Shanghai and Shenzhen markets was 173.66 billion yuan, a decrease of approximately 116 billion yuan from the previous day [1] Sector Performance Semiconductor, Brokerage, and Banking - The semiconductor, brokerage, and banking sectors showed a downward trend [1] Hydropower Concept - The hydropower concept saw a resurgence, with companies like Shen Shui Institute and Shanghai Port Bay hitting the daily limit up, with Shen Shui Institute rising by 20% [3][4] - Other notable performers included Sanhe Intelligent and Guotong Co., both gaining over 10% [3] High-Speed Rail Concept - The high-speed rail sector surged in the afternoon, with companies like Jiao Da Tie Fa increasing by nearly 24% and Jin Ying Heavy Industry hitting the daily limit up [6][7] - Other companies in this sector, such as Aerospace Intelligent Equipment and Tie Ke Track, also saw gains exceeding 10% [6] Commercial Aerospace Concept - The commercial aerospace sector was active, with companies like Fei Wo Technology and De En Precision Engineering both hitting the daily limit up [10][11] - The frequency of satellite launches in China has significantly increased, indicating a rapid development phase for the commercial aerospace industry [12][13]