下列有关主键的叙述错误的是()。 A.不同记录的主键值允许重复 B.主键是数据表中的

题型:单项选择题

问题:

下列有关主键的叙述错误的是()。

A.不同记录的主键值允许重复

B.主键是数据表中的某一个字段

C.不同表中的主键可以是相同的字段

D.表中的主键的数据类型可以定义为自动编号或文本

考点:计算机基础计算机基础题库
题型:单项选择题

阅读理解。

     Easter Sunday, which falls on April 4th this year, dates back nearly 2,000 years. It is celebrated by hundreds

of millions of people around the world. For my family, it is considered the greatest holiday of the year.

     Every Easter my brothers and I would wake up early and, like Christmas morning, run downstairs to see

what surprises were waiting for us. We were always excited when the Easter Bunny (兔子), who is like Father

Christmas, came and left us a basket of candy. It's wonderful. It is like there is a miracle every Easter morning. 

    Our mother, however, would not let us eat the chocolates like we wanted. The chocolate bunnies, and candy

eggs would have to wait. Instead, we would have to get dressed in our new clothes.

    Then my family would go to church. After church we would go to an elder family members' house for a

feast (盛会). My mother's family came to the US from Eastern Europe, so we would often eat many traditional

dishes. My favorite was ham and a special potato salad. We usually had 20 or more family members at the

dinner. 

    After dinner my cousins, brothers and I would go outside. While we were sleeping the night before, our

parents had hidden plastic eggs throughout the back yard. We would always have a contest to see who could

find the most eggs. The winner would get a prize. It was our annual Easter Egg Hunt. Sometimes, in summer,

we would discover an egg we missed on Easter.

1. When does Easter come this year? [ ]

A. On April the fourth.

B. The last Sunday.

C. Nearly 2000 years ago.

D. Untold.

2. Who does the writer expect to come every Easter? [ ]

A. Father Christmas.

B. The Easter Bunny.

C. His cousins.

D. His relatives from Europe.

3. In what order would the following happen?

   a. We would have a big get-together.                 b. We would go to church.

   c. We would dress ourselves in new clothes.      d. Our parents would hide plastic eggs in the backyard.

   e. We would have Easter Egg Hunt. [ ]

A. b-a-d-e-f

B. c-b-a-d-e

C. d-c-b-a-e

D. d-c-e-b-a

4. Which of the following is NOT true about Easter? [ ]

A. Easter falls on April 4th every year.

B. Children usually get a basket of candy on that day.

C. People often have a family dinner.

D. Traditional food like ham and salad is served.

5. What does the passage mainly talk about? [ ]

A. An introduction to Easter.

B. Easter traditions.

C. A moving story.

D. An Easter Egg Hunt.

题型:单项选择题

按神经科分级方法将肌张力分为()

A.1级

B.2级

C.3级

D.4级

E.5级

题型:单项选择题

下面关于人与自然的对象性关系的表述中,不正确的是:()

A.人必须遵循自然规律;

B.人不能离开自然界;

C.人能够认识自然规律;

D.人的生命、意识、活动可以不受制于自然界;

题型:单项选择题

请说出五种妇科禁用药?

题型:单项选择题

“网络问政”成为2010年“两点”新亮点。一项由中国政府网和新华网联合提出的“我向 * * 报民生”“两会“建议征集活动,吸引了超过20万网民的参与。“两会”前夕,温 * * 与网民进行了在线交流。

“网络问政”()。

①是公民参与政治生活的新型、有效平台;

②有利于促进政府决策的科学化和民主化;

③使公民直接行使国家权力的渠道更加畅顺;

④扩大了公民的政治权利。

A.①②

B.①④

C.②③

D.③④

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