Computer Basic Information
In MODEMS

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

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Computer Basic Information
Which of the following is not true of immediate processing?

Transactions are processed shortly after a real-world event occurs
It can be used in an airline-reservation system
It is often used in real-time applications
All of these
It can occur with either sequential of direct-access files

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