在学生信息表关系Student中,________属性是外键(foreign key

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问题:

在学生信息表关系Student中,________属性是外键(foreign key)。

A.学号

B.学生名

C.系号

D.书籍费

考点:计算机等级考试数据库技术三级数据库技术笔试70
题型:单项选择题

阅读理解。

  I am Liu Mei. I am a girl. I am a middle school student. My cousin is the same age as me. She's really

nice, but she always borrows my things. Last week, she borrowed my math book and didn't return it. So

I couldn't do my homework. I don't want to have a fight with my cousin, because she's my best friend. I

don't know what to do.  

根据短文内容,判断正(T)误(F)。

( )1. Liu Mei is the same age as her cousin.

( )2. Her cousin never borrows Liu Mei's things.

( )3. Her cousin couldn't do her homework.

( )4. Her cousin borrowed Liu Mei's math book and returned it.

( )5. Liu Mei doesn't want to have a fight with her cousin because she's her best friend.

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通信电源专业人员在修改各种参数设置后,必须对和调整后的设置进行(),修改各种参数后,直流供电系统出现异常情况时,应立即恢复原设置值。

题型:单项选择题

被定义为:“连续使用后易产生身体依赖性、能成瘾的药品”是

A.毒性药品
B.精神药品
C.麻醉药品
D.放射性药品
E.直接作用于中枢神经系统的药品

题型:单项选择题

由于使用外汇贷款的企业在经营管理方面存在严重问题而引起的风险是()。

A.市场风险

B.生产技术风险

C.项目建设风险

D.经营管理风险

题型:单项选择题

下列心脏病中宜采用洋地黄类药物治疗的是()

A.预激综合征合并心房颤动

B.二度或高度房室传导阻滞

C.病态窦房结综合征

D.单纯舒张性心力衰竭伴流出道梗阻

E.心室率快速的心房颤动且重度收缩性心力衰竭

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