以下属于感觉对比现象的有
A. 吃完苦药后再吃糖觉得糖更甜
B. 一样亮的灰分别放在白背景和黑背景上看起来明度不一样了
C. 声音停止后,耳朵里还有这个声音的余音在萦绕
D. 绿叶陪衬下的红花看起来更红了
E. 红色看起来觉得温暖.
When you think of a microcomputer, perhaps you think of just equipment itself. But there is more to it than that. An information system has five parts: people, procedures, software, hardware and ( ).
A. mouse
B. keyboard
C. data
D. system unit
Data is one of the five components in an information system. Data is stored document file, worksheet file, database file and ( ).
A. application software
B. presentation file
C. communication device
D. system unit
Hardware consists of many kinds of equipment, including( ).
A. keyboard
B. mouse
C. monitor
D. virus