午间涨跌停股分析：31只涨停股、7只跌停股，航天系概念活跃，航天机电5天3板

Core Viewpoint - The A-share market showed significant activity with 31 stocks hitting the daily limit up and 7 stocks hitting the limit down, indicating a volatile trading environment on December 4th [1] Group 1: Stock Performance - Aerospace-related stocks were notably active, with Aerospace Machinery achieving three limit ups in five days [1] - The reducer concept stocks strengthened, with Jiu Lun Intelligent and Ri Fa Precision both hitting the limit up [1] - The Moore Thread concept saw gains, with Lian Mei Holdings and Chu Ling Information also reaching the limit up [1] Group 2: Continuous Limit Up Stocks - Hai Wang Biological achieved seven consecutive limit ups [1] - Rui Neng Technology recorded five limit ups in six days [1] - Gao Le Co., Ltd. had four consecutive limit ups, while Tai Yang Cable and An Ji Food both achieved three consecutive limit ups [1] Group 3: Limit Down Stocks - ST Yuan Zhi faced three consecutive limit downs [1] - *ST Zheng Ping experienced two consecutive limit downs [1] - Other stocks such as *ST Ao Wei and *ST Jian Yi also hit the limit down [1]