What is the maintenance of hydraulic structures? Need to go to the construction site?

Plumber is the floor of hydraulic engineering (plumber) and electrician, referred to as plumber for short. Plumbers are construction workers. They install some simple circuits and waterways on the site. There are two kinds of plumbers, installation plumbers and maintenance plumbers. The installation of plumbers is mainly the installation of embedded fire bridges for civil water supply and drainage, as well as decoration, such as home decoration. The plumber is the water and electricity repairman recruited for hotels and school properties. The former is relatively tired, with low technical content, and is basically manual labor. The latter is relatively easy, but the technical content is not high.