单选题：In a virtual memory system , ________.
In a virtual memory system , ________.@[A](1)
A. determining how to map virtual addresses to physical addresses is of great importance
B. each virtual address space is much smaller than the real address space
C. MMUs convert physical addresses to virtual addresses during execution
D. when the system is ready to run a process, the system loads the process’s code and data from main memory into cache
A.determining how to map virtual addresses to physical addresses is of great importance
B.each virtual address space is much smaller than the real address space
C.MMUs convert physical addresses to virtual addresses during execution
D.when the system is ready to run a process, the system loads the process’s code and data from main memory into cache
答案：A
A. determining how to map virtual addresses to physical addresses is of great importance
B. each virtual address space is much smaller than the real address space
C. MMUs convert physical addresses to virtual addresses during execution
D. when the system is ready to run a process, the system loads the process’s code and data from main memory into cache
A.determining how to map virtual addresses to physical addresses is of great importance
B.each virtual address space is much smaller than the real address space
C.MMUs convert physical addresses to virtual addresses during execution
D.when the system is ready to run a process, the system loads the process’s code and data from main memory into cache
答案：A