如图所示,理想变压器的原副线圈匝数比n1:n2=1:10,副线圈与阻值R=20Ω

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问题:

如图所示,理想变压器的原副线圈匝数比n1:n2=1:10,副线圈与阻值R=20Ω的电阻相连.原线圈两端所加的电压u=20sin20πt(V),则(  )

A.副线圈输出交流电的频率为10Hz

B.交流电压表的示数为20V

C.电阻R上消耗的电功率为2kW

D.原线圈中电流的最大值为100A

考点:变压器的结构和原理
题型:多选题

阅读理解。

     Frankenstein is one of the world's most famous horror stories. It's about a doctor who creates a new

man from the body parts of dead people and brings it to life. But the experiment goes wrong and the monster

(怪兽) kills the doctor and many others. The story has been read by millions since it was first published and

in the last hundred years it has been made into dozens of movies. Many people are surprised to learn its writer

was a 19-year-old woman, called Mary Shelley.

     Mary was born into a rich London family in August 1797. She was educated by her parents and when she

was 13 decided to become a writer. In 1812, she met the famous writer Percy Shelley and they soon got

married. Sadly for Mary, their first child died soon after birth in Italy. In her diary, Mary wrote about a dream:

"I dreamt that my little baby came to life again-that it had only been cold and that we rubbed it before the fire

and it lived."

    In 1816, Percy Shelley and 19-year-odl May visited the poet Lord Byron at his home in Switzerland.

Because of the bad weather they stayed indoors reading horror stories. One night, Byron asked everyone to

write their own story. Mary thought of her dream and wrote the story Frankenstein.

     Frankenstein was published when Mary was 21, and became a huge success. Many people didn't think a

19-year-old woman could write so well and believed her husband was the real writer.

     Although famous, Shelley's life was full of sadness. Only one of her four children lived and in 1822 her

husband died in a swimming accident. Mary was broken-hearted and decided not to marry again. She devoted

herself to her child and continued to write until her death in 1851.

1. What do we know about he story Frankenstein?

A. It was really written by Mary Shelley's husband.

B. It was been read by millions of people.

C. It was written to remember Shelley's husband.

D. It is the most famous story in the world.

2. Where was Mary Shelley when she wrote the story Frankenstein?

A. In England.

B. In Italy.

C. In Switzerland.

D. In France.

3. In which order to the following take place?

a. Bad weather made everyone stay indoors reading horror stories.

b. The story Frankenstein was first published.

c. Mary wrote about a dream in her diary.

d. Mary met the famous writer Percy Shelley.

e. Movies based on the story of Frankenstein were made.

A. a, c, b, e, d

B. d, c, a, b, e

C. c, a, b, d, e

D. b, a, d, c, e

4. How old was Mary Shelley when she died?

A. 43

B. 48

C. 51

D. 54

5. What can we lear n about Mary Shelley from this passage?

A. She experienced a lot of sadness in her life.

B. She wasn't considered a good writer during her life.

C. She was educated at her local school.

D. She became very rich because of the story Frankenstein.

题型:多选题

下列各项对医疗公正的正确描述不除外()。

A.社会每个成员在需要基本医疗服务时,有及时得到治疗的权利

B.社会每个成员不受种族、性别的限制

C.社会每个成员不受职业、年龄的限制

D.社会每个成员在需要任何医疗服务时都能得到满足

E.社会每个成员有平等享受基本医疗的权利

题型:多选题

鼓励泌尿系统病人多饮水的目的是()。

A.有利于炎症消退

B.补充血容量

C.减少结石形成

D.清除体内代谢废物

E.冲洗 * *

题型:多选题

CTOD("04-01-01")+20的结果是______。

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粗纱张力的作用是什么?如何形成?

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