Grade card

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Grade card

Grade card

Bar code card is a symbol that combines lines and blanks according to certain coding rules to represent certain letters, numbers and other information. During identification, a bar code reader is used to scan and obtain a group of reflected light signals. After photoelectric conversion, the signals are converted into a group of electronic signals corresponding to lines and blanks. After decoding, the signals are restored to corresponding text numbers and then transferred to the computer.

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Grade card