Computer Basic Information
In MODEMS

All of these
A digital signal changes some characteristic of a carrier wave
Digital signal is amplified
Several digital signals are multiplexed
None of these

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Computer Basic Information
Which of the following is not true of a magnetic disk?

It is expensive relative to magnetic tape
It does not provide an automatic audit trail
Users can easily update records by writing over the old data
It provides only sequential access to stored data
All of these

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