[analysis of midday trading on April 20] A total of 16 shares rose by the daily limit of April 20 in the two markets, with no connected shares, and 7 shares failed to seal the board, with a closure rate of 69% (excluding St shares, delisted shares and unopened new shares). In terms of individual stocks, there are no connected stocks today, the data element plate China Science and Technology spread 8 days and 5 boards, the first board of Railway Science and Technology, the first board of Kos shares, and the first board of Zhongshi Science and Technology growth Enterprise Board of liquid-cooled server.