Group 1: AI Data Centers - The AI data center sector is experiencing a "valuation bubble + geopolitical risk" pricing logic, with rising supply chain costs due to Trump's tariff policies[1] - Major tech companies plan to invest over $345 billion in AI infrastructure in 2025, with Microsoft alone investing $80 billion[16] - NVIDIA's Blackwell chip production is accelerating, with four major public cloud vendors purchasing 3.6 million units, capturing 92% of the global AI GPU market[18] Group 2: Industrial and Energy Equipment - The price index for aircraft engines and components in the U.S. was 273.188 in February 2025, stable month-on-month and up 6.2% year-on-year[2] - The price index for gas turbines increased by 5.35% year-on-year and 0.22% month-on-month in February 2025[63] - The price index for electric and special transformers was 433.246 in February 2025, stable month-on-month and up 1.07% year-on-year[48] Group 3: Infrastructure Investments - The U.S. is expected to invest an average of $44 billion annually in the power grid from 2023 to 2030, with total investment in distribution networks reaching $581.5 billion[21] - In 2025, China's State Grid and Southern Grid are projected to invest over 825 billion yuan, a significant increase from 2024[31] Group 4: Defense and Aerospace - The U.S. government defense price index was 117.187 in Q4 2024, stable quarter-on-quarter and up 3.2% year-on-year[44] - Raytheon Technologies (RTX) continues to benefit from increased defense spending, particularly in missile systems and aerospace electronics[5]