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原来，他大腿骨也摔坏了，根本无法再骑马。Round 2: 1-3,(6) Relevant quality management documents;"As long as they are hit, they are basically shot one at a time. The lethality of steel balls is much smaller than that of bullets. A dozen or twenty bullets can also kill one. They are animals after all, and they are still afraid of bullets. However, the speed is fast and it is really difficult to deal with." Liu Guangyuan said.故事从《监察医牵牛花》最后的第二年春天开始拉开帷幕，牵牛花一个人来到东北寻找母亲的遗体，故事由此展开。她深刻面对东日本大地震和母亲的死亡，与前作中无法描绘的东日本大地震以外的大规模灾害相对应的姿态被截取下来。"Yes, it's the kind of big rats. They are more difficult to deal with than big wasps. Especially when these two things go together, one is in the sky and the other is underground. We should be too busy to take care of them. Moreover, the kind of big rats have very strong teeth. It's a piece of cake to bite off their arms and legs in three or two, and they move very quickly." Zhang Xiaobo said.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.