911 buzzer alarm (C language), c51 source, suitable for novice to use

022-蜂鸣器911报警(C语言)
........................\911
........................\911.C
........................\911.hex
........................\911.lnp
........................\911.LST
........................\911.M51
........................\911.OBJ
........................\911.Opt
........................\911.plg
........................\911.Uv2
........................\911_Opt.Bak
........................\911_Uv2.Bak

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