printer control character
... 打印机控制系统 printer control system 打印机控制字符 printer control character 打印机忙碌 printer busy ...
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ASCII设备控制字符最初是用于控制硬件设备的，如：打印机、录音设备。这个字符不属于HTML文档。
ASCII device control characters were originally designed to control hardware devices like printers and tape drives. These characters have nothing to do inside any HTML document.
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