题目内容

In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow. Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What does the professor say about the invention of the elevator

A. It created design problems for architects.
B. It was needed for transporting construction materials.
C. It enabled architects to design taller office buildings.
D. It made skyscrapers more expensive to build.

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哈夫曼树的结点个数不能是偶数。（）

A. 正确
B. 错误

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一棵哈夫曼树的带权路径长度等于其中所有分支结点的权值之和。( )【合肥工业大学2000二、4(1分)】【烟台大学2007二、7(1分)】

A. 正确
B. 错误

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将一棵树t转换为孩子兄弟链表表示的二叉树h，则t的后根序遍历是h的( )。【北京邮电大学2001一、2(2分)】

A. 前序遍历
B. 中序遍历
C. 后序遍历

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In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow. Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What does the professor mainly discuss

A. The development of the modern skyscraper.
B. The skyscraper’s effect on urban areas.
C. Problems with future skyscraper construction.
D. Safety regulations for skyscraper design.

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A. It created design problems for architects. B. It was needed for transporting construction materials. C. It enabled architects to design taller office buildings. D. It made skyscrapers more expensive to build.

哈夫曼树的结点个数不能是偶数。（）

一棵哈夫曼树的带权路径长度等于其中所有分支结点的权值之和。( )【合肥工业大学2000二、4(1分)】【烟台大学2007二、7(1分)】

将一棵树t转换为孩子兄弟链表表示的二叉树h，则t的后根序遍历是h的( )。【北京邮电大学2001一、2(2分)】

A. It created design problems for architects.
B. It was needed for transporting construction materials.
C. It enabled architects to design taller office buildings.
D. It made skyscrapers more expensive to build.