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5.2. 9 Requirements for creepage distance and linewidth:After studying the design pattern during this period of time, I still have a lot of feelings, because when I am writing code now, I often think about whether I can use any design pattern to refactor here. Therefore, after learning the design pattern, I feel that it will slowly affect the way you think about writing code. Here is a summary of the design patterns. First, all the design patterns can be sorted out. Second, an index can be made to help everyone collect.富二代兄弟爱上了龙凤胎兄妹,简单来说神哥兄弟两人喜欢上一对龙凤胎但他们以为是同一个人 最后应该是神哥和哥哥 弟弟和妹妹？才过垂花门，就有小丫头看见了，忙转身跑向里面传信。　　即以毛泽东为首的中国共产党人在尚未建国之际，就充满忧患意识，如何防止像李自成政权的悲剧发生，提出对“其兴也勃焉”、“其亡也忽焉”，中国几千年历史没有一个朝代能逃出这个“兴亡周期率”的怪圈问题。1. The borrower is required to repay the principal and interest on a monthly basis. In this way, the amount to be repaid each month is very small and the repayment pressure is also small. The lender can receive the repayment on a monthly basis with little risk. 2. Credit audit introduces socialization factors. That is, the borrower's ID card, account book, marriage certificate, academic certificate, etc. can all increase personal credit scores, but these data do not need to be provided with the original, and their authenticity is difficult to be effectively guaranteed. Therefore, the auction believes that the online community and users' online circle of friends are also one of the important parts of their credit rating system. The more friends and members' friends in the inner circle of the website, the higher the number of times individuals borrow and lend, and the higher the credit rating. In this way, the network activity and the user's personal identity, financial ability, bank credit, etc. together form a complete set of evaluation system. The unsecured and unsecured mode has only credit requirements for the borrower but no mortgage, and does not assume guarantee responsibility for the lender. The lender and the borrower trade on their own, and the auction only exists as a witness and trading platform. Therefore, in fact, this form is relatively risky for lenders. However, the winning interest rate for auction is often above 15%, which is still a great temptation for lenders. Therefore, investment in auction and loan has higher risks and higher returns. Because the transaction is concluded in the form of competitive bidding and both parties to the transaction are free to trade, the auction and loan belong to pure intermediary P2P. The auction will blacklist the borrower who fails to repay the loan within the time limit and make it public, but it will not compensate the lender for the economic losses. The auction will only refund the lender's handling fee, so the potential risks of fund recovery can only be borne by the lender itself.