地面兵装板块8月18日涨5.84%，北方长龙领涨，主力资金净流出3.15亿元

Market Performance - The ground equipment sector increased by 5.84% on August 18, with North China Long Dragon leading the gains [1] - The Shanghai Composite Index closed at 3728.03, up 0.85%, while the Shenzhen Component Index closed at 11835.57, up 1.73% [1] Individual Stock Performance - North China Long Dragon (301357) closed at 170.88, up 15.02% with a trading volume of 128,700 shares and a transaction value of 1.991 billion [1] - Great Wall Military Industry (601606) closed at 66.29, up 10.01% with a trading volume of 1,274,300 shares and a transaction value of 7.799 billion [1] - Inner Mongolia First Machinery (600967) closed at 27.77, up 8.69% with a trading volume of 2,183,900 shares and a transaction value of 5.748 billion [1] - Other notable stocks include Jieqiang Equipment (300875) up 4.45%, Optoelectronics Co. (600184) up 4.23%, and North Navigation (600435) up 3.04% [1] Capital Flow Analysis - The ground equipment sector experienced a net outflow of 315 million from institutional investors, while retail investors saw a net inflow of 275 million [1] - Notable capital flows include North Navigation (600435) with a net inflow of 64.35 million from institutional investors, while it faced a net outflow of 44.67 million from speculative funds [2] - Great Wall Military Industry (000519) had a net inflow of 45.45 million from institutional investors, but also saw a net outflow of 33.71 million from speculative funds [2]