A股收评：三大指数小幅下跌，沪指守住4000点，培育钻石板块回撤

Market Overview - The Shanghai Composite Index fell by 0.07% to 4000.14 points, the Shenzhen Component Index decreased by 0.36% to 13240.62 points, and the ChiNext Index dropped by 0.39% to 3122.03 points, with a total market turnover of 1.96 trillion yuan, down by 491 billion yuan from the previous trading day [1][2]. Sector Performance Medical and Pharmaceutical Sector - The medical commercial sector saw significant gains, with stocks like Yao Yigou rising by 19.9%, Jianfa Zhixin increasing by over 14%, and others like Renmin Tongtai and Hefei China hitting the daily limit [4][5]. - The demand for cold and flu medications is expected to rise due to a predicted peak in flu cases in mid-December to early January [4]. Oil and Gas Sector - The oil and gas extraction and service sector experienced a rally, with stocks such as PetroChina Oilfield Services and Huai Oil hitting the daily limit, while Tongyuan Petroleum and Huibo Po rose by over 5% [6][7]. - A new round of fuel price adjustments was announced, with gasoline and diesel prices increasing by 125 yuan and 120 yuan per ton, respectively, leading to a rise of 0.10 yuan per liter for 92 and 95 octane gasoline and 0 diesel [6]. Insurance Sector - The insurance sector saw substantial gains, with China Life Insurance rising nearly 2%, China Pacific Insurance increasing by over 2%, and New China Life Insurance up by over 3% [8]. Cultivated Diamond Sector - The cultivated diamond sector faced a downturn, with stocks like World falling over 11% and Huifeng Diamond dropping over 9% [9][10]. Photovoltaic Equipment Sector - The photovoltaic equipment sector experienced a significant pullback, with stocks such as Aters falling over 14% and other companies like Longi Green Energy and JinkoSolar also seeing declines of over 7% [11][12]. - A rumor regarding a high-level executive from JA Solar stating that a "storage platform has failed" circulated, but was later denied by the China Photovoltaic Industry Association [10]. Wind Power Equipment Sector - The wind power equipment sector also saw declines, with stocks like Hewei Electric dropping over 5% and others like Taisun Wind Energy and Tianeng Heavy Industry falling over 4% [12]. Market Outlook - According to Galaxy Securities, the domestic economic fundamentals are showing signs of recovery, and if inflation can stabilize further, most industries are expected to emerge from their current contraction phase. The long-term outlook for the A-share market remains positive, with no excessive concern over fluctuations around the 4000-point mark in the short term [12].