___( )___技术是在主存中同时存放若干个程序,并使这些程序列交替执行,以提高系统资源的利用率。
A.多道程序设计
B.Spooling
C.缓冲
D.虚拟设备
参考答案:A
Last week I ______ a report about agriculture. [ ]
A. write
B. written
C. wrote
D. was wrote
“人是万物的尺度”这句话是谁说的?