大盘今日调整，关注A500ETF易方达（159361）、沪深300ETF易方达（510310）等产品布局机会

Group 1 - The Sci-Tech Innovation Board 50 Index consists of 50 stocks with large market capitalization and good liquidity, prominently featuring "hard technology" leaders, with over 60% in semiconductors and more than 75% combined in medical devices, software development, and photovoltaic equipment [3] - The index experienced a decline of 1.6% and has a rolling price-to-earnings ratio of 183.7 times [3] - The Hong Kong stock market's H-share ETF tracks the Hang Seng China Enterprises Index, which includes 50 large-cap, actively traded stocks from mainland China listed in Hong Kong, covering a wide range of industries with over 85% in consumer discretionary, financials, information technology, and energy [3] Group 2 - The H-share ETF index saw a decrease of 0.6% and has a rolling price-to-earnings ratio of 10.4 times [3] - The valuation metrics are closely related to corporate earnings and are suitable for industries with relatively stable profits and less cyclical impact [3] - The historical rolling price-to-earnings ratio data for various indices is available from their respective launch dates, with the Sci-Tech Innovation Board 50 Index launched on July 23, 2020, and the Hang Seng China Enterprises Index launched on August 8, 1994 [3]