中材节能：子公司联合签署3.47亿元总承包合同

Group 1 - The core point of the article is that Zhongcai Energy (603126) announced a contract signing for a comprehensive utilization project with a total value of 347 million yuan (including tax) [1] Group 2 - The subsidiary Wuhan Building Materials Institute is the leading entity in the joint venture for the project [1] - The project is related to the Baiyun Rock Mine in the Xiang'an District [1]