installation of equipment, lines and pipelines for general industrial, public and civil construction projects, power transformation and distribution station projects with a voltage of 35kV and below, and production and installation of non-standard steel members. Mechanical and electrical installation is a relatively large-scale project. When some large enterprises move, a project will take nearly half a year to implement, and the technical requirements for installation are also quite large. The project includes boilers, ventilation and air conditioning, refrigeration, electricity, instruments, motors, compressor sets and radio, film and television broadcast control equipment.