单项选择题

在三种集中式总线判优控制系统中，_______方式优先级别低的设备可能很难获得请求。

A、计数器定时查询
B、链式查询
C、独立请求查询
D、中断查询

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单项选择题

【单选题】实验室用的20分游标卡尺（N=20），其精确度是多少毫米？

A.1
B.5
C.05
D.02

10. John had to give up the idea of going out since a ____(堆，叠)of files awaited him on his desk.

答案： stackJohn had to give up the idea of going out since a stack...