How much is it to build a mine a year?

1, the first-class constructor is divided into 10 majors, such as architecture, electromechanical, municipal, etc. The market demand and supply of each major are different. Generally speaking, majors with large demand and small supply, such as municipal administration, port and shipping, communications, etc. The income level will be higher than that of industries with less demand and more supply, such as construction, electromechanical and expressway. The first-class constructor is divided into architecture, electromechanical, municipal, etc. 10 majors. The market demand and supply of each major are different. Generally speaking, the majors with large demand and less supply, such as municipal administration, port and shipping, and communications, have higher income levels than those with small demand and more supply, such as architecture, electromechanical, and highways.