Computer Basic Information
An essential difference between the operating system that runs a typical desktop computer and the operating system that runs a typical PDA is that .......

the desktop OS manages hardware resources whereas the PDA OS does not.
the desktop computer has an OS whereas a PDA does not.
the desktop OS can run several programs simultaneously whereas the PDA OS cannot.
None of these
the desktop OS has a graphical user interface whereas the PDA OS does not.

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Computer Basic Information
A large computer designed to handle complex scientific calculations

will not use numbered address locations
None of these
will likely require a character addressable storage unit
may use only a firmed word-length storage approach
must use fixed length words of four character each

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