珠江钢琴盘中涨停，上演“地天板”

Group 1 - The core point of the article is that Zhujiang Piano experienced a significant stock price increase, reaching a limit up, with a current price of 6.81 yuan and a trading volume of 4.05 billion yuan [2] Group 2 - The stock price surge indicates strong market interest and potential investor confidence in Zhujiang Piano [2] - The trading volume of 4.05 billion yuan suggests high liquidity and active trading in the stock [2]