The flange industry is not an ordinary FMCG industry. It has the characteristics of stability, large volume, but long cycle. Unlike those FMCG products, which can be broadcast live, they can be delivered and purchased only based on the price. Each industry has its own characteristics, and each industry has its own characteristics. Although the world is changing rapidly and changing with each passing day, the characteristics of the flange industry have not changed much. We basically still have such characteristics. For the flange industry, if there is any change, it is the change of transmission speed and product diversification. And the change of production technology and mode, but this has no special connection with the salesman when developing flange purchasers. The salesman needs to grasp the scale in front of developing flange purchasers. Make a plan. For each flange purchaser, the salesman should have different frequencies and service methods. Although our general principle of serving flange buyers remains unchanged, we strive to provide better services for customers. However, it should also be done that different service methods are adopted for different customers. Each flange purchaser has its own preferences, so we can't develop flange purchasers without differences. We can't turn back from two quagmires, which will affect our work efficiency and customers' attitude towards our flange suppliers. This is the principle that every person who develops flange purchasers should accurately grasp. Master the frequency and customer preferences. You can't always find customers or never find customers. The specific analysis depends on the characteristics of each flange purchaser.