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【多选题】
对C#中“命名空间”(或称“名字空间”)理解合理的包括
A.
命名空间是一种层次管理的工具,可以看做文件夹
B.
多个命名空间之间不能嵌套使用
C.
C#程序必须引入的命名空间是:using System
D.
名空间的定义是以关键字 namespace 开始
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