It is professional to drink beverages through a straw.（)

s means that they have a chance to enter the history books

A) access B) attachment C) appeal D) approach

What role does integrity play in personal and professional relationships？

A) It helps to create team spirit

B) It facilitates communication

C) It is the basis of mutual trust

D) It inspires mutual respect

A、Software engineers shall be fair to and supportive of their colleagues

B、Software engineers shall participate in lifelong learning regarding the practice of their profession and shall promote an ethical approach to the practice of the profession

C、Software engineers shall advance the integrity and reputation of the profession consistent with the public interest

D、Software engineers shall maintain dependence in their professional judgment

m. He asks his friend Ma Kai for help. Li Qiang: Hi, Ma Kai. Do you know the China Railway Museum？ I heard that many people all over the world visit it every day. Ma Kai: Yeah. It is the () professional museum about the railway system in China. Li Qiang: Oh, really？ It must be () . Ma Kai: Yes, you.ll be able to see a large number of () objects, () ,photos, () and multi-media, etc. All these will give you a detailed () to the development of the Chinese railway system in the past century. Li Qiang: Where is the Museum () ？ Ma Kai: It is located in Chaoyang District, about 15 kilometers () of downtown Beijing. Li Qiang: Is it () for you to take my brother and me there？ I.d like someone () with the museum to go with us. Ma Kai: Sure, I.d be very glad to be your tour guide.

The True Story of a Young Man

When Reginald Lindsay received a scholarship to Morehouse College in Atlanta, Georgia, what he wanted most was a good job with a good salary. But soon he became interested in the civil rights movement. At present he has a plan which he hopes will take him to Congress as a southern representative.Now in his first year at Harvard Law School, Reg is making careful plans. After earning his degree, he expects to return to the South to practice law among the poor. "I want to help them understand what their rights are and to help them achieve them," he says. Then he hopes to run for political office at the local and state level until he is ready to try for Congress.Reg grew up in a low-income Negro section of Birmingham, Alabama. Brought up by his grandparents after his parents were divorced while he was very young, Reg has been living through a period of far-reaching progress in race relations. In the summer of 1968 Reg himself became a good example of this progress when he became the first Negro student appointed to a special new program. The program introduces bright young students to the workings of the Georgia State government and encourages them to seek employment there after finishing their education. "I've been lucky," he says. "I seem to have been in the right place at the right time."

But luck is only part of Reg's story, for he has made the most of opportunities that came his way. He learned to read in kindergarten and began visiting the public library regularly to borrow books. His grandparents encouraged him, though neither of them had much education, and they bought him a set of encyclopedias. "I loved those books," he re- members. "I used to come downstairs before breakfast and read short articles. I enjoyed reading about famous men, and then I would pretend to be one of them. I guess it was partly a childish game and partly an escape. It wasn't too much fun to be a Negro when I was a kid."

While studying for his bachelor's degree at Morehouse College, Reg worked on several political campaigns helping candidates get elected to government offices. At the same time he maintained a "B" average while majoring in political science. He worked as a student advisor to earn extra money for his college expenses, and he was granted a scholarship for a year of study at the University of Valencia in Spain.With just two more years to complete at Harvard Law School, which also gave him a scholarship, Reg has made a good start on his professional career. He says, "The good life for me is the kind of life where I can find satisfaction in public service."

1.When Mr. Lindsay received a scholarship to Morehouse College, he wanted to ____

A、become a southern representative in Congress

B、participate in the civil rights movement

C、get a good job with good pay

D、help candidates get elected to government office

2.We learn from the passage that Lindsay ____

A、spent his childhood with his grandparents

B、loved to read history books

C、had well-educated grandparents

D、learned to read after his parents divorced

3.Lindsay felt that ____

A、reading about famous men would help him to succeed

B、pretending to be a famous person was a way to escape from the realities of life

C、reading in the public library was a good way to educate himself

D、reading widely would provide him with many opportunities in the future

4.In Lindsay's time, ____ .

A、there was a great improvement in race relations

B、black people were still looked down upon

C、the Georgia State government encouraged black students to work for it

D、it was impossible for blacks to enter famous universities

5.According to the passage, Lindsay's purpose in life was to ____

A、become a famous lawyer

B、be elected to political office at the local level

C、get another scholarship to study abroad

D、serve the public

一般对相位闭合差要求是满足（)（△t为闭合差，T*为该反射层反射波视周期)

A . △t≤T*/3

B . △t≤T*/2

C . △t≤T*

D . △t≥T*

A.30mV/T

B.40mV/T

C.50mV/T

D.60mV/T

A.J

B.W

C.T

D.T/C

当u_S（t)为下列情况时，求题7-37图所示电路的响应u_C：（1)u_S（t)=10Ɛ（t)V;（2)u_S（t

当u_S(t)为下列情况时，求题7-37图所示电路的响应u_C：

(1)u_S(t)=10Ɛ(t)V;

(2)u_S(t)=10δ(t)V。

已知α=（1，2，3)^T，β=（1，1/2，1/3)^T，A=αβ^T，求A⁴。

图6-12示出信号x₀（t)和x₁（t)波形,若M₀表示对x₀（t)的匹配滤波器,M₁表示对

x₁(t)的匹配滤波器,求:

(1)分别画出M₀和M₁的冲激响应h₀(t)和h₁(t)的波形;

(2)分别粗略画出M₀对x₀(t)和x₁(t)的响应波形以及M₁对x₀(t)和x₁(t)的响应波形;

(3)比较这些响应在t=4时的值,若保持x₁(t)不变,如何修改x₀(t)使接收机更容易区分x₀(t)和x₁(t),也即使M₀对x₁(t)的响应和M₁对x₀(t)的响应在t=4时为零值.