练习2--单选与复选按钮\Project1.bpr
.....................\Project1.cpp
.....................\Project1.exe
.....................\Project1.obj
.....................\Project1.res
.....................\Project1.tds
.....................\Unit1.cpp
.....................\Unit1.dfm
.....................\Unit1.h
.....................\Unit1.obj
.....................\Unit1.~cpp
.....................\Unit1.~dfm
.....................\Unit1.~h
练习2--单选与复选按钮