多址技术是为众多移动用户公用公共信道所采用的一种技术,请列举三种基本实现方法?

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问题:

多址技术是为众多移动用户公用公共信道所采用的一种技术,请列举三种基本实现方法?

考点:通信工程师网络优化考试网络优化考试题库
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血液常用的保存液ACD和CPD加用一种物质就成为ACDA和CPDA,这种物质是()。

A.枸橼酸

B.枸橼酸钠

C.磷酸二氢钠

D.腺嘌呤

E.葡萄糖

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月经过多见于()

A.月经失调

B.附件炎

C.子宫内膜炎

D.子宫肌瘤

E.宫内放置节育环

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Marie Curie was a Polish-born physicist and chemist and one of the most famous scientists of her time. Together with her husband Pierre, she won the Nobel Prize in 1903, and another one in 1911.

Marie Sklodowska was born in Warsaw on 7 November 1867, the daughter of a teacher. In 1891, she went to Paris to study physics and maths at the Sorbonne where she met Pierre Curie, professor of the School of Physics. They married in 1895.

The Curies worked together studying radioactivity(放射性), building on the work of the German physicist Roentgen and the French physicist Becquerel. In July 1898, the Curies announced the discovery of polonium(钋). At the end of the year, they announced the discovery of another, radium(镭). The Curies, along with Becquerel, won the Nobel Prize for Physics in 1903.

Pierre’s life was cut short in 1906 when he was knocked down and killed by a carriage. Marie took over his teaching post, becoming the first woman to teach at the Sorbonne, and devoted (献身于) herself to continuing the work that they had begun together. She received a second Nobel Prize, for Chemistry, in 1911.

The Curies’ research was important in developing X-rays in surgery. During World WarⅠ, Marie helped fixed X-ray equipment, which she herself drove to the front lines. She helped train doctors for the International Red Cross.

Although she achieved much success, men scientists in France were still against Marie, and she never received any financial help from her work. By the late 1920s her health was beginning to become worse. She died on 4 July 1934 from her dangerous research. The Curies’ eldest daughter Irene was a scientist and winner of the Nobel Prize for Chemistry.

小题1:All the following people contributed to Marie’s first Nobel Prize EXCEPT _____.

A.Irene

B.Pierre

C.Becquerel

D.Roentgen小题2:We can know from the text that Marie’s work______.

A.won her respect from men scientists

B.brought her some financial help

C.had a bad effect on her health

D.had no influence on her children小题3:Which is the right order of the following events?

①Marie became a teacher at the Sorbonne.

②Marie helped train doctors.

③The Curies discovered polonium.

④The Curies won the Nobel Prize for Physics.

⑤The Curies discovered radium.

A.①④⑤③②

B.③⑤④①②

C.⑤④①③②

D.②③⑤①④小题4:Which of the following about Marie is NOT true?

A.She married at the age of 28.

B.Her parent was a teacher.

C.She was the first woman teacher at the Sorbonne.

D.She helped the International Red Cross fix X-ray equipment.

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在交通流的统计分布时,离散型分布一般可考虑采用____________、____________,连续型分布一般可考虑采用__________、____________。

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血精最早见于:

A.《灵枢》

B.《金匮要略》

C.《素问》

D.《外科正宗》

E.《诸病源候论》

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