已知对于n阶方阵A,存在自然数k.使得Ak=0,试证明:矩阵E-A为可逆矩阵并求它的

题型:问答题

问题:

已知对于n阶方阵A,存在自然数k.使得Ak=0,试证明:矩阵E-A为可逆矩阵并求它的表达式(E为n阶单位矩阵)。

考点:普通考研考研数学(三)考研数学三
题型:问答题

下列疾病中,哪一项不会见到心悸伴胸痛

A.心绞痛

B.肺梗死

C.心包炎

D.大叶性肺炎

E.心功能不全

题型:问答题

阅读理解。

     A Northern Ireland team is leading a research to develop a thinking computer which can sense a

user's mood.Researchers at Queen's University in Belfast hope to complete the 10 million Euro

project for an emotionsensitive computer within four years.

     The aim is to enable computers to think and behave more like humans.The Europewide project is

being led by the university's School of Psychology and involves 160 researchers from 27 institutions.

The university's researchers developed the scheme and signed the contract with the European

Commission.The academics said the work will build upon attempts to create "multimodal interfaces

(多模式界面)" which allow machines to sense and respond to the moods of the user.

     Programme leader Professor Roddy Cowie said while it sounds like science fiction, computers

which respond to human emotion will appear in the future."At the moment, our use of computers is

limited by the fact that we need a keyboard and a screen to access them," he said."It would make a

big difference if we could interact with them by speaking normally-perhaps through a microphone and

a transmitter (传感器)." But emotion is part of normal speech, and experience has shown that most

users are deeply uncomfortable with speech interfaces that ignore it-too uncomfortable to use them

very much."If we can make computers more intuitive (富于直觉的) and expressive, and also less

challenging to use, there is great potential to let people make fuller use of information technology."

     The emotionsensitive computer would have its own "personality" and establish a social relationship

with the user."It's a fair bet that in 30 years' time, emotionsensitive interfaces will be as much part of life

as windowandmouse interfaces are now," said Professor Cowie.The project team believes such computers will play a major role in teaching and learning.

1.Which of the following statements is TRUE about the project?

A.It aims to create an emotionsensitive computer.

B.It can create a 10 million Euro profit.

C.It is led by a Southern Ireland team.

D.It has been completed within four years.

2.How will computers sense users' moods?

A.Through a screen.

B.Through a keyboard.

C.Through the voice of users.

D.Through multimodal interfaces.

3.We can infer from the passage that a person's emotion________.

A.varies from time to time

B.is determined by his own personality

C.plays an important role in normal speech

D.makes people uncomfortable when one is speaking

4.What conclusion can we draw from the last paragraph?

A.Emotionsensitive computers can talk freely as human beings.

B.It will be difficult for people to use emotionsensitive computers.

C.Emotionsensitive computers have been widely used in teaching.

D.It will be common for people to use emotionsensitive computers in the future.

题型:问答题

小儿有些疾病是可以预防的,由于开展计划免疫和加强传染病管理,已使________、________、________、________、________、________等许多小儿传染病的发病率和死亡率大大下降。

题型:问答题

12V240Z-1型柴油机每个气缸盖采用()气缸盖螺栓紧固在机体上。

A、2条

B、4条

C、6条

D、8条

题型:问答题

EVDORevA有哪些优势()?

A.提供高速分组数据业务

B.有效保护现有投资

C.灵活的组网配置

D.简单的网络结构

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