港股通的交易规则有哪些特别之处？

Group 1 - The trading hours of the Hong Kong Stock Connect differ significantly from those of the mainland A-shares, with trading occurring from 9:30 to 12:00 and 13:00 to 16:00, requiring investors to be aware of this time difference for trading operations [1] - The eligible stocks for the Hong Kong Stock Connect are subject to specific selection criteria, including being part of the Hang Seng Composite Large Cap Index, Mid Cap Index, or meeting market capitalization requirements for H-shares listed in mainland China, with the list being adjusted regularly based on market conditions [1] - The settlement mechanism for the Hong Kong Stock Connect follows a T+2 settlement system, contrasting with the T+1 rule of mainland A-shares, meaning that stocks bought on the trading day (T) can only be sold on T+2, necessitating careful management of funds and stock turnover by investors [1] Group 2 - The Hong Kong Stock Connect does not impose limits on price fluctuations, and this rule applies to the stocks eligible for trading through the connect; the minimum trading unit for stocks is not standardized and varies by stock, requiring investors to check specific stock information [2]