如图男孩打弹弓的情景,你能联想到哪些物理知识?(至少写出两条) (1)_____

题型:问答题

问题:

如图男孩打弹弓的情景,你能联想到哪些物理知识?(至少写出两条)

(1)______;

(2)______.

考点:动能和势能的应用力的作用效果
题型:问答题

阅读理解。

     Jean is a bright young woman who comes from a rich and famous family. She goes to a good university

and has everything that money can buy. Well, almost everything. The problem is that the people in Jean's

family are so busy that they can hardly find time to be with her. In fact, Jean is quite lonely.

     So Jean spends a lot of time on her QQ. She likes being anonymous (匿名), talking to people who do not

know about her famous family and her rich life. She uses the name Linda on QQ and has made a lot of friends

whom she keeps in touch with quite often.

     Last year Jean made a very special friend on QQ. His name was David and lived in San Francisco. David

was full of stories and jokes. He and Jean had a common interest in rock music and modern dance. So it always

took them hours to talk happily on QQ and sometimes they even forgot their time. Of course, they wanted to

know more about each other. David sent her a picture of himself: He was a tall, good-looking young man with

a big, happy smile. As time went by, they became good friends and often sent cards and small things to each

other.

     When Jean's father told her that he was going on a business trip to San Francisco, she asked him to let her

go with him so that she could give David a surprise for his birthday. She would take him the latest DVD of

their favourite rock singer. But when she knocked on David's door in San Francisco, she found that her special

friend was only a ten-year-old boy named Jim!

1. Because the people in Jean's family have little time to stay with her, she is _____.

A. glad

B. lonely

C. excited

D. calm

2. Jean thought "David" was a special friend because he _____.

A. was good-looking

B. told her stories

C. sent her small things

D. made her very happy

3. What would Jean take "David" for his birthday?

A. Her photos.

B. A DVD.

C. Some money.

D. Some story-books. 

4. From this passage, we can learn that _____.

A. Jean likes rock music

B. Jean is an old woman

C. Jean lives a poor life

D. Jean's father is a singer

5. Which of the following is TRUE according to the passage?

A. David is a short young man.

B. David doesn't like modern dance.

C. Jean likes to talk with David.

D. Jean seldom sends cards to David.

题型:问答题

下列哪项不是肺循环的特点()。

A.肺血管壁薄

B.肺动脉收缩压为22mmHg,舒张压为8mmHg

C.正常情况下肺循环血流量几乎等于心排血量

D.缺氧导致肺血管舒张

E.正常情况下肺血量约占全身血量的10%

题型:问答题

单位产品成本报告期比基期下降5%,产量增加5%,则生产费用()。

A.增加

B.降低

C.不变

D.难以判断

题型:问答题

银行营业场所和文物系统博物馆的备用电源的容量,应能保证入侵报警系统正常工作()小时。

A.12

B.24

C.48

题型:问答题

团队管理中应该容人所短,但有些短处不能包容,比如()。

A、个性

B、气质

C、行为方式

D、价值观

E、思想观念

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