The essential elements within the system and the interaction of intersystem form the ecological system, economic system and social system, which produce compositeresults with the intervention of man.
系统内要素、系统间相互作用，构成生态系统、经济系统和社会系统，在人们的干预下产生综合效益。
2
Test results show that composite foundation scheme of the post grouting CFG pile satisfies requirements of design, which proves that this scheme has good economic benefit.
检测结果表明，该后压浆CFG桩复合地基满足设计要求，具有良好的经济效益。
3
This application practice showed that steel concrete composite beams are very suitable for long span structures and have good technical and economicresults.