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Research on Current Gold Market:In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:阿良良木历（神谷浩史 配音）正在为了即将到来的考试进行着刻苦的准备，一次偶然中，阿历发现镜子里竟然映不出自己的身影，惊慌失措的他找到了专门研究不思议事件的斧乃木余接（早见沙织 配音）和影缝余弦（白石凉子 配音），让阿历没有想到的是，两人竟然告诉他，他即将要变成吸血鬼了。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.01　少年の国讲述帅气的死神去人间度假，去了解真爱，并与一个人间女孩谈恋爱的奇幻搞笑爱情故事！25 knives (BB was found out because it was not expected when it was bought at a low price, but it was found to be worth it when it arrived. Except for the leather and rough workmanship, there was no hemming, which was not much different from Inzer's belt. When it wanted to make another strip, BB had already stopped production); Nylon Magic Belt 65 yuan.