John is ______ one of the best shop assistants who ______ in this department store.[ ]

A. thought of; work

B. thought; works

C. considered; work

D. considered as; works

与虚拟存储器的等效访问速度无关的是( )

A．访存页地址流

B．页面替换算法

C．主存的容量

D．辅存的容量