A construction services contract is a contract which has as its objective the realization by whatever means of civil or building works, in the sense of Division 51 of the Central Product Classification.
List of Division 51, CPC:
一般建设我们rk for buildings 512
一般建设我们rk for civil engineering 513
Installation and assembly work 514 + 516
Building completion and finishing work 517
Other 511 + 515 + 518