【实验20】蜂鸣器蜂音控制\beep
........................\beep.c
........................\beep.hex
........................\beep.lnp
........................\beep.LST
........................\beep.M51
........................\beep.OBJ
........................\beep.Opt
........................\beep.plg
........................\beep.Uv2
........................\beep_Opt.Bak
........................\beep_Uv2.Bak
........................\key.plg
【实验20】蜂鸣器蜂音控制