关系的直观解释是二维表,表中每一列的值只能取自同一个域。

题型:判断题

问题:

关系的直观解释是二维表,表中每一列的值只能取自同一个域。

考点:高职试题企业信息管理中央广播电视大学2009
题型:判断题

任务型阅读。

     Many people believe sharks are dangerous and always try to hurt or even kill humans. In fact, 94

percent of the world's 400 species (种类) are harmless to humans. Shark Exhibition at the National

Aquarium (水族馆) in Baltimore in the US proves this. Visitors can touch young sharks, see their eggs

develop and watch a dozen different species swim smoothly around a huge tank.

     Most people don't know that shark attacks don't happen very often. Humans are more likely to be

killed by lightning (闪电 ) than by a shark.  And to make this point clear, the museum has set up a

special touching pool for children.  There kids can learn, from an early age, not to be afraid of sharks.  

They can watch them develop inside their eggs and feel the skin of the older sharks.

     "People are afraid of what they don't know," said Nancy Hotchkiss, an organizer of the exhibition,

"Sharks have been around for 400 million years and play an important role in the ocean's food chain

(食物链). We want people to discover that sharks are amazing animals that need our respect and

protection. "

     About 100 million sharks are killed every year around the world by humans. Thousands of sharks are

hunted in Asia for special food, and many others are caught in nets. when fishermen are hunting other fish.

     It is a worrying situation that some countries have not put measures (措施) to protect the special fish.

1. 题判断正误(“T”“F”);2题完成句子;3-4题简略回答问题;5题将文中画线句子

    译成汉语。

1. Sharks are dangerous and always try to hurt or even kill humans. ( )

2. The use of that special touching pool is for children to __________

3. Why did the organizer of the exhibition say that sharks need to be protected?

                                                                                   

4. What does the author worry about?

                                                                                   

5. ____                                                                       

题型:判断题

一定温度下,恒容密闭容器中进行的反应:A(s)+3B(g)⇌2C(g)+D(g),下列物理量不能确定达到平衡状态的是(  )

A.各物质的浓度不随时间变化

B.容器的压强不再变化

C.B的生成速率和D的生成速率为3:1

D.混合气体的密度不再变化

题型:判断题

如图是童谣“小蜂蜜”的一段歌词与乐谱,当小玲唱到“大家一起”这四个字期间,音调逐渐升高.关于这期间小玲声音变化的描述正确的是(   )

A.声带振动一次的时间逐渐增加

B.声带每秒振动的次数逐渐增加

C.声波的传播速度逐渐增大

D.声波的振动幅度逐渐增大

题型:判断题

选出成语使用正确的一项

A.这一天,两人在玄武湖公园狭路相逢,互相拥抱,摸鼻子,那股亲热劲就别提了。

B.这幅画虽然较有新意,但是色调太暗,大家看了,都不赞一词。

C.美好理想的实现有待于大家的努力拼搏,决不能守株待兔,坐享其成。

D.无论是创作歌词还是作曲,都要付出艰辛的劳动,所谓异曲同工。

题型:判断题

根据马克思地租理论,土地价格存在的根源是()。

A.垄断地租

B.级差地租

C.绝对地租

D.农业地租

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