DB的三级体系结构是对()抽象的三个级别。
A.存储器
B.数据
C.程序
D.外存
正确答案是B
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明:本文由翰林刷题小程序授权发布,如需转载请注明出处。
本文链接:https://doc.20230611.cn/post/234753.html
上一篇:当锅炉受到汽轮发电机组负荷变化等外部扰动时,请回答以下三个问题:(1)汽轮发电机组减负荷时对蒸汽参数的影响?(2)汽轮发电机组增负荷时对蒸汽参数的影响?(3)诸参数变化方向是否相同?
下一篇:Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets. Bricks are strong, hard, and resistant to fire and ( )from the weather, so they have been used as a building material for
Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets.
Bricks are strong, hard, and resistant to fire and ( )from the weather, so they have been used as a building material for