这一板块，爆发！多股涨停

Group 1 - The defense and military industry sector saw significant gains, becoming one of the main highlights of the market on December 18, with the sector's index rising nearly 2% [2][3] - Notable stocks in the defense sector included Aerospace Universe, which surged over 18%, and West Testing, which increased by over 17%. Other stocks like Tianjian Technology, Beimo High-tech, and China Satellite reached their daily limit [3][4] - The overall A-share market showed divergence, with the ChiNext index dropping over 2%, while the Shanghai Composite Index opened lower but quickly rebounded [3] Group 2 - New stock Yuan Chuang Co., Ltd. (001325) experienced a dramatic rise, with its price increasing by over 210% during the trading session [6] - Yuan Chuang specializes in the research, production, and sales of rubber track products, serving various sectors including agriculture and construction [8][9] - The company has established a strong competitive advantage in the domestic rubber track market, with a wide range of products and a global sales network [9] Group 3 - In the Hong Kong market, the Hang Seng Index experienced a decline, with a drop of over 0.8% at one point, while the Hang Seng Tech Index fell by more than 1% [10][11] - Among the stocks in the Hang Seng Index, notable declines were seen in companies like Pop Mart and Xiaomi, while stocks like Sino Biopharmaceutical and China Petroleum showed gains [11]