据新华社报道，根据《中华人民共和国出口管制法》等有关法律法规，4月4日，商务部会同海关总署发布关于对钐、钆、铽、镝、镥、钪、钇等7 类中重稀土相关物项实施出口管制措施的公告，并于发布之日起正式实施。此举引发多国关注。 商务部新闻发言人在公告发布当日表示，此次中国政府依法对相关物项实施出口管制，目的是更好维护国家安全和利益，履行防扩散等国际义 务。相关物项具有军民两用属性，对其实施出口管制是国际通行做法。 美日印澳"四方安全对话"（QUAD）7月1日在美国华盛顿召开外长会议，美国当天宣布与日印澳启动关键矿产倡议。 当地时间2025年7月1日，美国华盛顿特区，日本外务大臣岩屋毅在美国国务院与印太"四方安全对话"机制成员国举行记者会。视觉中国 图 据环球网报道，美国国务院发言人布鲁斯6月30日表示，"四方安全对话"外长会议将重申美日印澳对自由开放的"印太地区"的共同承诺，并突出四 国战略伙伴"维护主权、加强海上安全和建立弹性供应链"的共同决心。 据美国广播公司（ABC）报道，美日印澳四国外长在华盛顿会谈后发表联合声明，宣布启动"四方关键矿产倡议"，旨在确保关键矿产供应链的安 全与多元化，加强经济安全和集体韧性。路透 ...

Investment Rating - The industry investment rating is "Positive" (maintained) [5][12] Core Viewpoints - The recent military parade on September 3 has increased market attention on the "Deep Sea Technology" strategy, which emphasizes resource security, national defense construction, and blue economy, with situational awareness being a key focus [5] - The government work report has elevated "Deep Sea Technology" to a strategic level, highlighting the need for a comprehensive underwater perception system to address security challenges posed by foreign reconnaissance devices in China's waters [5] - The construction of situational awareness capabilities is deemed essential for development, with sonar equipment being the core component due to the complexities of underwater signal processing [5] Summary by Relevant Sections - **Investment Highlights**: The focus is on the construction of situational awareness capabilities, particularly in underwater signal processing, which faces significant challenges due to environmental noise and target stealth [5] - **Sector Performance**: Key companies to watch include China Marine Defense, Jizhi Co., and Zhongke Haixun, each with unique capabilities in underwater information acquisition, intelligent underwater technology, and sonar systems [5] - **Company Profiles**: - **China Marine Defense**: Engages in underwater information systems and has acquired assets from various military units [5] - **Jizhi Co.**: Collaborated with Zhijiang Laboratory to develop intelligent underwater sound technology, entering a revenue-generating phase [5] - **Zhongke Haixun**: Provides signal processing platforms and has core technologies in sonar systems, capable of offering comprehensive solutions [5]