单选题：Why the Shortest-Job-First process scheduling cannot be implemen

Why the Shortest-Job-First process scheduling cannot be implemented?@[C](1)
A. It is too complex
B. Requires special hardware
C. The length of the next CPU burst is not known
D. The length of the next I/O burst is not known





A.It is too complex
B.Requires special hardware
C.The length of the next CPU burst is not known
D.The length of the next I/O burst is not known


答案：C