1, construction preparation works in the front, the main project in the back.
2, constraints on the duration of the key lines of the project in the front, the construction time is relatively short after the project.
3, civil engineering in the front, equipment installation in the back.
4, structural engineering in the first, after the installation project.
5, constraints subsequent to the project in the first, immediately before the project in the second.
6, engineering construction in the first, engineering goods procurement in the second.