下列关于原发性高血压的说法,正确的是()。 A.激素类药物引起 B.由肾脏病变引起

题型:单项选择题 A型题

问题:

下列关于原发性高血压的说法,正确的是()。

A.激素类药物引起

B.由肾脏病变引起

C.大动脉中层逐渐增厚

D.超声心动图常见右心房增大

E.频谱多普勒舒张期二尖瓣血流频谱A/E>1

考点:超声波医学主治医师心脏和胸壁、胸膜腔心脏和胸壁、胸膜腔题库
题型:单项选择题 A型题

《担保法》中规定:学校、幼儿园、医院等以公益为目的的事业单位、社会团体不得为保证人。(五级、四级)

题型:单项选择题 A型题

阅读理解。

     "I sat-in at a restaurant for six months, and when they finally agreed to serve me, they didn't have what I

wanted"-so went a famous line. In reality, the sit-in movement was not a joke. It began in Greensboro, North

Carolina, at 4:30 P. M., on the afternoon of February 1, 1960. On that day, Ezell Blair Jr., Joseph McNeil,

David Richmond, and Franklin McClain entered an F. W. Woolworth store. They sat down at a segregated (隔

离的) lunch counter, ordered coffee, and then refused to leave when told, 'We don't serve Negroes.'"

     The four young men had expected not to be served. What no one had expected, however, was that they

would sit there and politely, but firmly, refuse to leave. This was 1960, and throughout the South black people

were not allowed to sit at the same lunch counters with whites, swim at the same beaches, use the same water

fountains, or worship at the same churches. Segregation was the law, and it meant separation of the races in

every way.

     The next day, the four returned to Woolworth's-this time accompanied by sixteen other students. Again

they sat at the lunch counter and requested service. Again they were refused. And again, they declined to leave.

On Wednesday, February 3, seventy students filled the Woolworth's store. This time, the group included white

students as well as black. Many brought school books and studied while they waited. By this time, their protest

had become known nationwide as a "sit-in".

     On Thursday, there was trouble. An angry group of white teenagers began shoving (推搡) and cursing them

but were quickly removed by the police. By February 10, the sit-in movement had spread to five other states.

     By September 1961, more than 70,000 people, both black and white, had participated in sit-ins at segregated

restaurants and lunch counters, kneel-ins at segregated churches, read-ins at segregated libraries, and swim-ins

at segregated pools and beaches. Over 3,600 people had been arrested, and more than 100 students had been

driven away. But they were getting results. On June 10, 1964, the U. S Senate passed a major civil rights bill

outlawing (宣布为非法) racial discrimination in all public places. President Lyndon Johnson signed it on July 2,

and it became law. But the highest credit still goes to the four brave students from North Carolina who first

sat-in and waited it out.

1. In this passage, "sit-in" refers to _____. [ ]

A. an activity where people sit together and drink coffee freely

B. a bill which outlaws racial discrimination in all public places

C. a form in which people peacefully sit and decline to leave

D. a polite behavior that everyone enjoys

2. Which statement can be concluded from the fifth paragraph in the passage? [ ]

A. The sit-in movement was not successful.

B. The sit-in movement had a positive result.

C. Only black people participated in sit-ins.

D. A lot of protesters were arrested, with some students driven away from school

3. What was the purpose of the civil rights bill passed in 1964? [ ]

A. The highest credit went to the four brave students.

B. It declared that segregation was a law.

C. The students were allowed to participate in sit-ins.

D. It made racial segregation against the law in all public places.

4. What is the passage mainly about? [ ]

A. Segregation was the law in the South.

B. The first sit-in was in 1960.

C. The sit-ins helped to end segregation.

D. The civil rights bill was passed in 1964 by the U. S. Senate.

题型:单项选择题 A型题

人体MRI最常用的成像原子核是()

A.氢原子核

B.钠原子核

C.钙原子核

D.磷原子核

E.铁原子核

题型:单项选择题 A型题

选用制冷剂时,应考虑对()无腐蚀和侵蚀作用。

A.金属

B.非金属

C.木材

D.有色金属

题型:单项选择题 A型题

简述近代测谎技术的发展。

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