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When the coil is energized, the iron core attracts the armature and the support plate to move down, and the contact points are turned on or off instantly. The piston rod and the lever slowly decrease due to the influence of the blocking nylon. After a certain period of time, the piston rod decreases to a certain position, and the delayed action contact is pushed by the lever to act, which is in an open state, while the moving contact is closed. The delay time of the relay is the time when the coil is energized until the delay contact completes its action. When the coil is powered off, the relay is restored by the recovery action of the spring.他立即跑过去，抱起一只小狗欢喜地叫道：狗狗。Data show that there were more than 6,000 companies engaged in private lending intermediary business when P2P platforms were in hot demand in China. After three years of survival of the fittest, according to incomplete statistics, there are only 1,958 platforms left. It can be predicted that the number of P2P platforms will continue to decrease. At present, some financial intermediary companies in Yixin, Auction, Qifang and Qingdao are relatively recognized. The following is a typical analysis of these P2P enterprises. Auction and loan: unsecured and unsecured mode. Auction and loan was established in Shanghai in 2007. It is a typical P2P online credit platform in China and can be used as a typical sample of P2P websites in China. Auction and loan use competitive bidding to realize the online lending process. The loan interest rate is determined by the supply and demand market of the borrower and the bidder. The enterprise does not charge other fees, and the main profit comes from service fees. The main process is as follows: the borrower releases the loan information, lists the relevant information such as the reason and amount of the loan, and gives the highest interest rate. Investors participate in the bidding, and the person with the lower interest rate wins the bid. The web page will show the borrower's loan progress and the number of bids completed. If the total amount of bid funds meets the needs of the borrower during the fund raising period, his loan will be declared successful. If the required funds cannot be raised within the prescribed time limit, the loan plan will be suspended. This mode of risk control has two characteristics:Save PictureIn the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows: