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B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).Female journalists prefer red clothes and heavy makeup, which is also their professional pursuit of quickly obtaining news resources. However, this is only a stepping stone. If we pursue good news, we need to design more valuable questions to have more professional charm.安泉当兵十余年一直在迎春的父亲贺司令员身边工作，司令员之女贺迎春（王璐瑶饰）离异后经父亲主张嫁给了老实厚道的安泉。迎春随安泉来到乡下，不久，安泉查出患尿毒症。为了治病，迎春南下找妹妹帮忙，一年后拿回巨款为安泉做了换肾手术。正是这救命的款项，引起了村民的误解。崩溃的迎春疯癫走失，被火山之乡的热心人救助后清醒过来。安泉找到火山之乡，告诉迎春自己已经解除了对她误会，希望她回去。就在迎春准备告别火山之乡的一刹那，她突然改变了主意。原来，她已经渐渐爱上火山乡人的那份真情。遭遇租房诈骗的职场新人艾晴，意外合租有过一面之缘的同校学弟颜川。两人在温馨的同居生活中逐渐互生好感，而此时艾晴初恋的回国，打乱了这一切因为少子化倾向的严重，日本颁发《NEET族保护法》，以结婚的形式向尼特人群提供辅助。男主角作为国家公务员，被选中作为法案的试行者，与系统指派的素未蒙面尼特族少女结婚所发生的种种故事。"Er... I really can't remember the model, it's green, probably so thick." Wang Zeduan could not remember the specific model of the explosive cylinder, Just said the color and gesticulated the approximate size with his hand, Later, I looked up the information and learned that The detonators used at position 142 were all Type 68 detonators, This is also a classic explosive barrel widely used throughout the Sino-Vietnamese border war. This type of explosive cylinder is 60 centimeters long each, As long as there is a need, it can be spliced indefinitely. The charge for each section is 2.2 kg, According to Wang Zeduan's description, At that time, the explosive barrel was made up of three sections. Then the total charge is as high as 6.6 kg, However, the high explosive bomb used in the type 66 152 mm howitzer, The charge is 6 kg, In other words, The charge of these three explosive cylinders is 0.6 kg higher than that of a 152 mm grenade. This is also basically in line with his description that it is more powerful than a shell. In addition, after being inserted into the ground, the two sections of the upper half form a certain blast height from the ground, In this way, the explosive power can be better exerted virtually to cover a wider area, so it is indeed reasonable that an explosive barrel can successfully achieve the tactical purpose of successfully clearing position 142 for the second time (the first clearance is 66-type directional anti-infantry mines and 72-type pressure/tripping anti-infantry mines).