A—feedback J—data processing B—floppy disk K—data capture C—check digit L—card reader D—keyboard M—electronic cash E—flow chart

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问题 A—feedback J—data processing
B—floppy disk K—data capture
C—check digit L—card reader
D—keyboard M—electronic cash
E—flow chart N—index
F—command O—encode
G—control unit P—shareware
H—backbone network Q—display unit
I—integrated circuit
( )校验数位 ( )编码

选项

答案C O

解析
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