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

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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
Examples:(D)键盘(N)索引
( )校验数位( )编码

选项

答案C,O

解析
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