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Principle: Traditional tobacco is smoked by ignition. The temperature of tobacco when burning reaches 800 degrees. Nicotine, carbon monoxide, tar, etc. will be produced in the process of tobacco burning. At the same time, tobacco itself also has fragrance released. Smokers are mainly satisfied by smoking nicotine and tobacco fragrance. There are more than 2,000 kinds of harmful ingredients produced by smoking, The main components that cause harm to human health come from tar produced in the combustion process, However, the working temperature of the heating non-burning electronic cigarette is about 300. Not more than 300 degrees, Tar is mainly produced at over 400 degrees, In other words, Heating does not burn electronic cigarettes. Due to the relationship between temperature, A small amount of tar is produced, which can be ignored. Moreover, the temperature at which heating does not burn is only about 300 degrees, so there is no combustion, no open flame and no soot. However, the aroma and smell of tobacco are still released, and smokers can also obtain nicotine, so that smokers can also obtain the feeling of smoking real cigarettes.本片以林冲和宋江为两条主线，保留了《水浒传》原著中鲁智深倒拔垂杨柳、拳打镇关西、林冲风雪山神庙、一百零八好汉水泊梁山等情节，讲述了众好汉被逼上梁山起义、同意招安却失败告终的故事。　　8年后，两人故地重游，景物各异，人事皆非。而阿秀的身世揭密，更是石破天惊，不由人万千感慨。刺绣事业又将两人命运相连。面对小吏、豪强、地痞、奸商对缂针绣的争夺，他们又开始了一段不平常的人生……至于自己在夷陵的防线完全就如同摆设一般，完全没有意义了，如果情况真是这样的话，可以说是非常危险的。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.? ? Obtain dept table operation) concrete implementation class (SQL factory access factory). The client of abstract factory needs to know which factories can choose, first new out the specific factory, and then use the specific factory to obtain specific objects.在他面前，朝廷重臣集结一堂，鸦雀无声。