The　standard(67)in　C　language　contain　many　useful　functions　for　input　and　output,　string　handling,　mathematical　computations,　an

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问题 The　standard(67)in　C　language　contain　many　useful　functions　for　input　and　output,　string　handling,　mathematical　computations,　and　system　programming　tasks.

选项 A、database
B、files
C、libraries
D、subroutine