检测U盘是否插入\Project1.cfg ...............\Project1.dof ...............\Project1.dpr ...............\Project1.exe ...............\Project1.res ...............\Project1.~dpr ...............\Unit1.dcu ...............\Unit1.ddp ...............\Unit1.dfm ...............\Unit1.pas ...............\Unit1.~dfm ...............\Unit1.~pas 检测U盘是否插入