600078，上演“天地板”

Group 1 - The stock of Chengxing Co., Ltd. experienced a significant drop, hitting the daily limit down after a previous streak of gains, with a trading volume exceeding 1.2 billion yuan [1][3] - Prior to the drop, the stock had achieved limit-up gains for four consecutive trading days and reached a nearly two-year high during intraday trading [3] Group 2 - The stock price fluctuations included a "Tian Di Ban" phenomenon, indicating extreme volatility in the market [1]