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？ （） [" Proxy"," View Helper"," Front Controller"," Session Façade"," Business Delegate"," Model-View-Controller"]
同步式交流电动机与异步式交流电动机相比有许多优点，下列各项中不属于同步式交流电动机特点的是（）。 ["电动机散热性能好","由变频电源供电时，可方便地获得与频率成正比的可变转速","体积小、重量轻","采用了矢量控制技术"]
改革开放符合党心民心、顺应时代潮流，方向和道路是完全正确的，成效和功绩不容否定，停顿和倒退没有出路。
You are designing a strategy to meet the security and financial requirements related to the Manifest application. What should you do?（） ["Configure a VPN server in Sydney.","Configure a VPN server in each branch office.","Configure a dial-up server in Sydney.","Configure a dial-up server in each branch office."]
患儿，男性，9岁，有近期左膝部碰伤史。突发高热、寒战、右下肢近膝关节处剧痛，活动受限。检查：局部深压痛，白细胞21×l09／L。最有可能的诊断是（） ["膝关节结核","膝关节缺血性坏死","化脓性关节炎","创伤性关节炎","急性血源性骨髓炎"]
简述商业银行不良贷款产生的原因。
