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宣告失踪应具备哪些条件。

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A Company.com developer has created a web application that includes a servlet for each use case in the application. These servlets have become rather difficult to maintain because the request processing methods have become very large. There is also common processing code in many servlets because these use cases are very similar. Which two design patterns can be used together to refactor and simplify this web application？（）

A. Proxy
B. View Helper
C. Front Controller
D. Session Façade
E. Business Delegate
F. Model-View-Controller

安防员在执勤或巡逻中，进见或遇见公司领导和业主时必须敬礼，敬礼时，五指并拢自然伸直，中指微接帽檐右角前约（）厘米处。

A. 1厘米
B. 1.5厘米
C. 2厘米
D. 2.5厘米