单选题：In the page replacement scheme a reference string is____.

In the page replacement scheme a reference string is____.@[B](1)
A. the number of frames allocated to a process
B. a string of memory references
C. a string of I/O references
D. the times spent on each page-fault service




A.the number of frames allocated to a process
B.a string of memory references
C.a string of I/O references
D.the times spent on each page-fault service


答案：B