单项选择题

关系数据模型中,与二维表中的”列“的对应的术语是()。

A.属性
B.关系
C.域
D.元组

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单项选择题
M: Would you please give Mr. Jackson a message?W: Sorry. Mr. Jackson is having a holiday in Chicago.Q: What can we learn from the conversation?()

A.The woman is busy working.
B.The woman can't take the message.
C.Mr. Jackson is on his holiday.
D.Mr. Jackson will be back soon.

单项选择题
女性,25岁。半年来因找不到合适工作,渐起情绪不好,常背地里哭泣,问其何故,说自己得罪了不少人,还说对不起父母养育之恩,给父母写遗书。整天愁眉苦脸,不愿出门,对任何事都不感兴趣,睡眠差。体检及神经系统检查未见异常。你考虑该病人诊断为
A.神经衰弱
B.反应性精神障碍
C.精神分裂症单纯型
D.抑郁症
E.人格障碍
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