处理器80486在保护虚拟地址模式下，可以寻址的物理内存地址空间大小为（）。
A.4KB
B.64KB
C.1MB
D.4GB
参考答案：D
Mike finished the work quickly, and ______. [ ]
A. So Tom did
B. So did Tom
C. So was Tom
D. So Tom was
现场核查客户定比定量的工作人员，应不得少于两人。
