油服工程板块12月12日跌0.12%，准油股份领跌，主力资金净流入877.19万元

Group 1 - The oil service engineering sector experienced a decline of 0.12% compared to the previous trading day, with Junyou Co., Ltd. leading the drop [1] - The Shanghai Composite Index closed at 3889.35, up by 0.41%, while the Shenzhen Component Index closed at 13258.33, up by 0.84% [1] - A table detailing the individual stock performance within the oil service engineering sector was provided [1] Group 2 - In terms of capital flow, the oil service engineering sector saw a net inflow of 877.19 million yuan from main funds, while retail funds experienced a net outflow of 1042.42 million yuan, and retail investors had a net inflow of 165.23 million yuan [2] - A table showing the capital flow for individual stocks in the oil service engineering sector was included [2]