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以下设计模式中，（请作答此空）模式使多个对象都有机会处理请求。将这些对象连成一条链。并沿着这条链传递该请求。直到有一个对象处理为止。从而避免请求的发送者和接收者之间的耦合关系。（）模式提供一种方法顺序访问一个聚合对象中的各个元素。且不需要暴露该对象的内部表示。这两种模式均为（）
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Accelerated analysis approaches emphasize the construction of（）to more rapidly identify business and user requirements for a new system. As an accelerated analysis technology，（）reads the program cod
Accelerated analysis approaches emphasize the construction of（请作答此空）to more rapidly identify business and user requirements for a new system. As an accelerated analysis technology，（）reads the program
Accelerated analysis approaches emphasize the construction of（）to more rapidly identify business and user requirements for a new system. As an accelerated analysis technology，（）reads the program cod
Accelerated analysis approaches emphasize the construction of（）to more rapidly identify business and user requirements for a new system. As an accelerated analysis technology，（请作答此空）reads the program
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