Beijing Chaoyang District No.24 Office Systems No.26 HSE No.34 Lian Oil No.43 Engineering Surveying and Mapping No.48 Lian Oil Technology No.49 Jian Zhu Jie Gou No.51 Thermal Energy Engineering No.52 Gong Cheng Ce Liang No.62 Jian Zhu Nuan Tong No.72 Surveying and Mapping No.86 Water Supply and Drainage Design No.87 Water Supply and Drainage Engineering