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This is the basis of the opening and closing principle, and the specific content: interface-oriented programming, relying on abstraction rather than concreteness. When a specific class is used when writing code, it does not interact with the specific class, but interacts with the upper interface of the specific class.This method means that the salesman's questions are easy for the customer to answer in an approving tone, that is to say, the salesman asks the customer to answer "yes" continuously to a series of questions raised in his promotion instructions, and then, when the request to sign the bill, the favorable situation has been created so that the customer can give another affirmative answer. If a salesman wants to seek customers and calls new customers without saying hello in advance, he can say, "I'd be happy to talk to you once. It must be very important to you to increase your company's turnover, isn't it? "(Few people will say" It doesn't matter ")," Well, I'd like to introduce to you our X products, which will help you achieve your goals and lead a more natural and unrestrained life. You really want to achieve your goal, don't you? "This allows customers to" yes "to the end.　　他赤條條去，他赤條條來，心裏到底糊塗還是明白。In the interview, the reporter saw that for ordinary small express delivery, many people would unpack the package at the express delivery point, take out the items and throw the package directly into the garbage can. Later, the reporter came to an express service point and happened to meet a staff member who was packing the mail. The boxes containing the clothes were packed thick. He said, "In case of scratching, in case the bags are broken and the clothes of others are scratched, how can they return the goods for exchange?"适才一念之间，她甚至想要和杀死儿子之后自刎的办法……九江护卫军见到有援兵前来，也是〖兴〗奋不已，聚集剩余了百多残兵，将王后和世子护卫在一边。"That 's for sure, With the fire shield of the gun group returning from the reverse direction, Then the "day" will not be sad, No matter how many enemies there are, Also can't rush the "no man's land" formed by the shell coverage, In addition to the comrades who died, Both Zhou Xiaolin and Jiang Yong are quite regrettable, One of them was missing a leg, One without half an arm, Although they all fainted from pain, But when I woke up, one leaned against the wall of the trench and one armed with one hand still insisted on fighting until the best moment. They were all good... "Zhao Mingkai was the same as other war veterans I interviewed. At the end of the day, he was also a little emotional and his resolute lips trembled slightly. I knew he was trying to control his emotions and didn't want to cry.