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- 基于c51的开发,由上位机发送1给单片机时,蜂鸣器以400ms频率发声,发2时以200ms频率发声,发3时以100ms频率发声,发4时关闲蜂鸣器-C51-based development, with a computer to send a single chip, the buzzer to 400ms frequency of sound, made 2 to 200ms frequency sound, send sound frequencies from 3 to 100ms, of