设A,B均为n阶非零矩阵,且满足A2+A=0,B2+B=0,证明:-1是A,B的特征

题型:问答题

问题:

设A,B均为n阶非零矩阵,且满足A2+A=0,B2+B=0,证明:

-1是A,B的特征值;

考点:普通考研考研数学(一)考研数学一
题型:问答题

阅读理解。

     July 16th was a bad day for Mr. Arthur Johnson. In the morning, he set out from his home in Santa

Barbara, Califomia. It was the start of his summer holidays and he decided to visit Wends at Las Vegas,

then he hoped to go fishing in Lake Mead, 40 km from Las Vegas.

     Johnson's troubles started while he was driving happily across the Mojave Desert. His car went wrong

and he tried to repair it. Then, to make matters worse, his attempts to start the car used up the battery (电

池) and left it useless. After Johnson had waited an hour in the hot sun, a Canadian driver, John Williams,

stopped and tried to help him. When both men failed, Williams promised to telephone a workshop to ask it

to send a truck to pull the car away and repair its fuel pump.

     Johnson left the keys in his car and sat in the shade of a large tree. Soon he fell asleep. While he was

sleeping, a repair truck arrived from San Pedro (the nearest town) and pulled his car away. Later on,

Johnson woke up and thought that somebody had stolen his car. He started to walk back towards San Pedro

but a police car stopped him to find out why he was walking in the desert.

     Johnson looked like a man wanted in Los Angels for robbery, so the police detained him at San Pedro

for the night. The next day, Johnson telephoned his friends in Los Angeles. They drove to San Pedro and

made the police believe that Johnson was a harmless salesman, so they set him free.

1. Johnson's car went wrong ____.

A. after he had passed San Pedro

B. before he left Santa Barbara

C. when he was getting near the Mojave Desert

D. not far from Los Angeles

2. Which way did Williams go when he left Johnson?

A. He drove on to Las Vegas.

B. He went back to Los Angeles.

C. Perhaps he went to San Pedro.

D. He continued his journey to Canada.

3. The underlined word "detained" most probably means ____.

A. to put into prison

B. to question seriously

C. to examine carefully

D. to keep in the police station

4. Which is the best title of this passage?

A. A Bad Day for Arthur Johnson

B. An Unlucky Car and the Driver

C. An Unpleasant Trip in the Desert

D. A Badly-planned Journey

题型:问答题

在个人住房贷款贷前咨询中,银行向拟申请个人住房贷款的个人提供有关信息咨询服务的渠道和方式不包括( )。

A.现场咨询
B.窗口咨询
C.信函咨询
D.网上银行

题型:问答题

在活动图中,用例和()的行为中的各活动之间通常具有时间顺序。

A.类

B.执行者

C.状态

D.对象

题型:问答题

( )是公安机关维护社会治安秩序和社会稳定的两手,二者互相补充,互相兼容.

A.管理与教育

B.打击与防范

C.建设与改造

D.防范与教育

题型:问答题

同步发电机自动并列装置是一种()。

A.自动调节装置

B.自动操作装置

C.安全自动装置

D.继电保护装置

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