E-R模型用于数据库设计的哪一个阶段________。A.需求分析 B.概念结构设计

题型:单项选择题

问题:

E-R模型用于数据库设计的哪一个阶段________。

A.需求分析

B.概念结构设计

C.逻辑结构设计

D.物理结构设计

考点:计算机等级考试数据库技术数据库设计
题型:单项选择题

单词拼写(每小题1分,共10分)

小题1:G_________________ from a key university is always an advantage in finding a job.

小题2:Online friends are not r__________________. They may cheat you.

小题3:She has o_________________ three parties with her partner in the past two weeks.

小题4:His d _______________ look suggests that he won’t change his mind at all.

小题5:Come on! You’ve changed your hair again. I hardly r_______________ you at the first sight.

小题6:When people use words and e_________________ different from the “standard language”, it is called a dialect.

小题7:Tens of thousands of people were killed. It was one of the most serious e______________ in the world.

小题8:Meredith, who is from America, can also speak f_______________ French.

小题9:During the national holiday, we made a j_______________ to Kuocang Mountain. Gosh!

小题10:My grandpa was successfully operated on in Taizhou Hospital last week and now he is r_________________.

题型:单项选择题

下列方法中,可以降低水的硬度的是(  )

A.吸附

B.煮沸

C.沉降

D.消毒

题型:单项选择题

凭证式国债是一种可上市流通的储蓄型债券,同时由具备凭证式国债承销团资格的机构承销。( )

题型:单项选择题

实现中国梦必须弘扬中国精神。这就是()。

A、以独立自主为核心的民族精神

B、以开放包容为核心的时代精神

C、以爱国主义为核心的民族精神

D、以改革创新为核心的时代精神

题型:单项选择题

导地线在档中的接头是强度弱点和事故多发点,因此规程要求重要跨越档不准接头,下列( )情况不准接头。

A.标准轨铁路;
B.高速及一级公路;
C.110kV及以上电力线路;
D.一、二级弱电线路。

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