At present, some environmental protection equipment owners entrust design institutes or engineering companies to undertake general contracting. To pick up their water treatment equipment, you need to go to the general contractor to bid and get subcontracted by the general contractor. There are also owners who invite tenders themselves. The cheaper the price, the better. The quality requirements of state-owned enterprises are generally higher. However, it is difficult for private enterprises to collect money and it is easy to win the bid. It is difficult for state-owned enterprises to win the bid, but the money is easy to collect. There are many things to learn, but if you work hard in this field, you will have a good future. I have only been in the business for a few years, and I have more than 2 million achievements every year.