![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
[主观题]
●The standard (67) in C language contain many useful functions for input and output,string
●The standard (67) in C language contain many useful functions for input and output,string handling,mathematical computations,and system programming tasks.
(67) A.database
B.files
C.libraries
D.subroutine
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)