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单选题
A Button is positioned in a Frame. Only height of the Button is affected by the Frame while the width is not. Which layout manager should be used？（）
A
FlowLayout
B
CardLayout
C
North and South of BorderLayout
D
East and West of BorderLayout
E
GridLayout
参考答案
参考解析
解析：
这个还是布局管理器的问题，流布局管理器（FlowLayout）将根据框架的大小随时调整它里面的组件的大小，包括高度和宽度，这个管理器不会约束组件的大小，而是允许他们获得自己的最佳大小，一行满了以后将在下一行放置组件；卡片管理器（CardLayout）一次显式一个加入的组件（根据加入时的关键字）；网格管理器（GridLayout）将容器划分为固定的网格，容器大小的改变将影响所有组件的大小，每个组件的大小都会同等地变化；边界管理器（BorderLayout）将容器划分为五个区域，分为东南西北和中间，东西区域的宽度为该区域里面组件的最佳宽度，高度为容器的高度减去南北区域的高度，这是一个可能变化的值，而南北区域的宽度为容器的整个宽度，高度为组件的最佳高度，中间区域的高度为容器的高度减去南北区域的高度，宽度为容器的宽度减去东西区域的宽度。
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Add an Allowed member set for the South clients to NorthRole.C
Create a new role for the sales manager and add a Denied member set for the South clients.D
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