下列说法正确的是( )A.二元一次方程一定只有一个解B.二元一次方程x+y=

题型:选择题

问题:

下列说法正确的是(     )
A.二元一次方程一定只有一个解
B.二元一次方程x+y=2有无数解
C.方程2x=3x没有解
D.方程中未知数的值就是方程的解
考点:方程的解二元一次方程的定义
题型:选择题

阅读理解。

     Zheng He, the Columbus of the East, was an amazing man.

     He was born in 1371 and, 11 years later, was caught by the army of a rich young man called Zhu Di

and made to work for him. Over time the rich man saw that Zheng He was very clever and strong and they

became close friends. In 1403 Zhu Di was made the King of China and he asked Zheng He to join his new

government.

     The King wanted to learn more about the world and show other countries his power. He ordered many

new ships to be built and made Zheng He their leader. Between 1405 and 1433, Zheng He led seven sea trips

to different parts of the world. He certainly travelled to India, Africa and the Middle East. A few people think

his ships may have even reached South America and Australia.

     Each trip lasted between two and four years and it is believed he sailed more than 50 000 kms during the

years of his travels. With 28 000 men and over 300 ships, such as boats for food, water and even soldiers'

horses, Zheng He led a fleet (舰队) whose size would not be equalled by Europeans for over 500 years I

     On these trips he brought with him many Chinese goods like silk and medicine to give to foreign kings or

to sell for local goods. He returned from each trip with boats filled with expensive things such as gold and

jewellery, foreign guests and strange animals like a giraffe.

     It is a pity that we may never learn everything about Zheng He' s travels. After he died in 1433, the new

king, who believed these trips were unlucky and too expensive, had them stopped and he burned almost all

the books about Zheng He's travels. It is only in the last 50 years that historians have begun to carefully study

the adventures of the great Zheng He.

1. Why did the Chinese King want Zheng He to sail to many different countries?

A. To bring new countries under the control of China.

B. To show the world how strong the King was.

C. To receive gifts from the kings of other countries.

D. To discover unusual animals.

2. What do we know about Zheng He from the passage?

A. He sailed to all seven continents.

B. Each of his trips lasted one year.

C. He died at the age of 62.

D. He was a successful businessman.

3. Which of the following did Zheng He NOT bring with him from China?

A. Medicine.

B. Gold.

C. Animals.

D. Silk.

4. What happened after Zheng He died?

A. He was forgotten for ever.

B. His ships were all burned.

C. The new king wrote a book about him.

D. Sea trips to other countries were stopped.

5. In what order did the following happen?

a. Zhu Di became the King.

b. Zheng He was caught by soldiers.

c. The books about Zheng He were all burned.

d. Foreigners were brought to China.

e. Zheng He visited India.

f. New ships were built.

A. e, b, a, f, d, c

B. b, a, e, d, c, f

C. f, a, b, d, c, e

D. b, a, f, e, d, c

题型:选择题

中国近代早期改良思想家主张“中体西用”。( )

题型:选择题

DOM is a platform- and language-(1)API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently,definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incorporated back into the presented(2).DOM is a (3) -based API to documents, which requires the whole document to be represented in (4)while processing it.A simpler alternative to DOM is the event-based SAX, which can be used to process very large (5) documents that do not fit into the memory available for processing.

空白(3)处应选择()

A.table

B.tree

C.control

D.event

题型:选择题

关于行政区界线界桩说明及详图的编印说法错误的是( )。

A.省级行政区划界线、界桩说明及详图是通过边界协议书及其附图来体现的
B.边界点位置说明应描述边界点的名称、位置、与边界线的关系等内容
C.边界线走向说明的编写以明确描述边界线实地走向为原则
D.边界协议书及其附图是以文本形式描述边界走向和具体位置

题型:选择题

用例图中通信关联正确的说法有()。

A、表示的是参与者和用例之间的关系

B、箭头表示通信关联中对话的主动与被动关系

C、箭头指向表示信息流方向

D、不强调主动与被动关系时可用不带箭头的关联实线

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