说明： Delphi 编写的单摆模拟，但没找出单摆的变化规律，程序还欠佳，思路就正确的
(Delphi prepared pendulum simulation, but did not find the variation of pendulum, the program also poor thinking on the right)
文件列表：
单摆
....\Project0704200125.cfg
....\Project0704200125.dof
....\Project0704200125.dpr
....\Project0704200125.exe
....\Project0704200125.res
....\Unit0704200125.dcu
....\Unit0704200125.ddp
....\Unit0704200125.dfm
....\Unit0704200125.pas
....\Unit0704200125.~ddp
....\Unit0704200125.~dfm
....\Unit0704200125.~pas
