地面兵装板块12月12日跌0.37%，光电股份领跌，主力资金净流出8.34亿元

Core Viewpoint - The ground armament sector experienced a decline of 0.37% on December 12, with optical electronics leading the drop, while the overall market indices showed positive movements [1][2] Group 1: Market Performance - The Shanghai Composite Index closed at 3889.35, up by 0.41% [1] - The Shenzhen Component Index closed at 13258.33, up by 0.84% [1] Group 2: Capital Flow - The ground armament sector saw a net outflow of 834 million yuan from main funds [2] - Retail investors contributed a net inflow of 706 million yuan to the sector [2] - Speculative funds recorded a net inflow of 128 million yuan [2]