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Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.少了很多疏漏，将来的内政外交终于有了一个得力的人帮自己打理。At that time, The helmets worn by our army are GK80 bulletproof helmets. After understanding, I am sure that Zhang Xiaobo is wearing this model. The material used to make it is 232 bulletproof steel, which has excellent performance and has good protective effect on various high-speed flying hard objects such as fragments and rubble lifted by explosion. However, because it is a pure metal helmet, it does have the disadvantage of being sultry when fighting in hot conditions.——你们家不是这样？再说，没有鸭蛋捡，还有别的嘛陈平此人喜爱收藏古籍异宝，可以说是个古代收藏家吧，故而在这方面颇有经验。如今，大战又将爆发，故而关前来往巡逻的兵士多了好些……郑昊，真是你这混蛋？啊哈哈……你这闷葫芦没死，真是太好了。