1, which is exclusively operated by relevant dealers. There are few enterprises without affiliated units. Therefore, it is difficult for you to directly contact front-line users, and there is often local protection. You can only contact these relationship dealers and let them draw water from them. It is not difficult to find them. They must be near industrial parks and development zones. Some doors are conspicuous, most of them are inconspicuous or have only one sign.
2. Several dealers compete. This situation is most beneficial to the enterprise, and the payment can be postponed indefinitely. Once one dealer is not satisfied, it will be changed to another. These dealers are concentrated in the business district of the city.
3, without going through the dealer, the manufacturer does it directly. It's rare unless the two families are related by blood. It is also not recommended for manufacturers to use it, because an enterprise uses it very little and often faces local protection.