【判断题】Tim’s family is in a mess because his father’s business has failed.
【单选题】Has the professor helped Tim?
A.
No, she hasn’t. She has criticized Tim’s ideas from the very beginning.
B.
Yes, she has. Tim now has clear guidelines to start working on his thesis.
C.
Not really. She could have been more helpful.
D.
Maybe she has, but it seems that Tim will write about the topic of her choice.
【单选题】数据库三级模式中,用逻辑数据模型对用户所用到的那部分数据的述是( )。
【单选题】数据库三级模式中,用逻辑数据模型对用户所用到的那部分数据的描述是()。
【单选题】数据库三级模式中,用逻辑数据模型对用户所用到的那部分数据的描述是( )。
【多选题】按照物流系统的空间范围不同,可以将物流分为()。
【多选题】按照物流系统的空间范围不同,可以将物流分为( )。
【多选题】按照物流系统的空间范围不同,可以将物流分为
【单选题】数据库三级模式中,用逻辑数据模型对用户所用到的那部分数据的描述是( )。A.外模式B.概念模式C.内模式D.逻辑模式
【单选题】Has Tim's family experienced such difficulty before?