永太科技涨停走出2连板，2天累计涨幅达21.0%。

Group 1 - The core point of the article is that Yongtai Technology has experienced a significant stock price increase, reaching a limit-up and achieving a cumulative rise of 21.0% over two days [1] Group 2 - Yongtai Technology's stock has shown strong performance, indicating positive market sentiment and potential investor interest [1] - The two-day cumulative increase suggests a robust trading activity and possibly favorable news or developments surrounding the company [1]