文件名称:t4t3
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利用类及派生类在屏幕上输出英语问好提示，其输出结果如下图所示。
-category and the use of derived classes in English output on the screen greets suggest that the output results as shown in the diagram below.
-category and the use of derived classes in English output on the screen greets suggest that the output results as shown in the diagram below.
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..........\t3.cpp
..........\t4.cpp
..........\t3.cpp
..........\t4.cpp