Operating System (OS)
The dispatcher

never changes task priorities
None of these
puts tasks in I/O wait
is always small and simple
actually schedules the tasks into the processor

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Operating System (OS)
The function(s) of the Syntax phase is(are)

to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.
to parse the source program into the basic elements or tokens of the language.
to build a literal table and an identifier table
None of these
to build a uniform symbol table

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