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题目:

A group of related fields is called a  () .
 

A、data ,B、file ,C、record ,D、database

题目:

It is possible to have more than one  ()  open in Word at the same time.

A、process ,B、text ,C、document ,D、block

题目:

 ()are essential for the protection of data.   

A、Memory ,B、Backups ,C、Files ,D、Blocks

题目:

 ()  is an output device displaying the result on paper.

A、Printer ,B、Mouse ,C、Display ,D、Disk

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