(1)在“用单摆测定重力加速度”的实验中,为使实验结果较为准确,在下列的部分器材

题型:实验题

问题:

(1)在“用单摆测定重力加速度”的实验中,为使实验结果较为准确,在下列的部分器材中应选用(用器材的字母代号填写)______。

A.1m长的细线.

B.20cm长的细线.

C.大木球.

D.小铜球.E.0.1s刻度的秒表.

F.有分针的时钟.

G.最小刻度是cm的刻度尺.

H.最小刻度是mm的刻度尺.

(2)某同学做“用单摆测定重力加速度”的实验,他用刻度尺测量了单摆的摆长L,并用秒表测得单摆在t时间内恰好完成n次全振动,则可算出重力加速度g的值为       。

考点:实验:探究弹力与弹簧伸长的关系实验:探究小车速度随时间变化的规律实验:探究加速度与力、质量的关系实验:探究功与速度变化的关系
题型:实验题

读下面四省(区)轮廓图,回答:

 (1)写出四省 简称及 行政中心:

A______,______;

B______,______;

C______,______;

D______,______.

(2)黑河-腾冲是我国人口分布的地理分界线,该线反映了我国人口分布的基本特点,那就是此线以东,人口______;此线以西,人口______.四省(区)中位于该线的东北端点的是______省.安徽省位于该线的______方;

(3)四省中有少数民族数目最多的是______省,其中有泼水节的少数民族______族.

题型:实验题

When do hurricanes occur().

A.Early spring.

B.The second half of each year.

C.Late summer.

D.The middle of the year.

题型:实验题

Alice's Adventures in Wonderland is one of the most loved children's books of all time, and many adults enjoy it as well. It tells the story of a young girl named Alice, who follows a rabbit entering a magical world called Wonderland: she has many experiences which seem to change the rules of reasoning or common sense. The popularity of the book comes from its imagination, interesting story, and art work.

The writer of the book is Lewis Carroll. In fact, Lewis Carroll was not the writer's real name. His real name was Charles Dodgson. One day, he took a boat ride down the Thames River to have a picnic with three little girls who were friends of the family. To keep them entertained on the ride, he told them a story in which Alice, the middle child, was the main character. They enjoyed the story very much.

Charles later wrote the story down under the name Alice's Adventures under Ground and gave it to Alice as a Christmas present. Later, he gave a copy to his friend George MacDonald. George read it to his children and they loved it. George suggested to Charles that he make a book from his story. Charles then wrote more parts to the story until it was around 35,000 words. It was first printed in 1866, with art work by John Tenniel, under the name Alice's Adventures in Wonderland. The book was an immediate success. 

One of its first fans was Queen Victoria. She immediately requested a collection of all of Lewis Carroll's works. She was surprised to find that they included many works on math. In fact, Charles Dodgson was a highly respected mathematician. This can be seen in many puzzles and plays on reasoning that appear in his books and poems.

Since the story was first printed, it has kept selling up to the present day. It has been translated into over fifty languages and has had several movies based on it. The story is even mentioned in the popular 1999 film The Matrix by the character Morpheus.

小题1:The passage is mainly about _____.

A.Charles' family life

B.a girl's adventurous experience

C.a magical world called wonderland

D.the birth of a book and its lasting influences小题2:Which of the following statements is TRUE according to the passage?

A.The writer published his works under his real name.

B.The character Alice was based on from George's child.

C.John contributed partly to the popularity of the book.

D.Charles offered a copy to George as a present.小题3:We can learn from the passage that _____.

A.Queen Victoria asked for a few of Charles' writings

B.Charles was good at reasoning and writing

C.Charles had his works translated into fifty languages

D.The Matrix was based on Alice's Adventures in Wonderland小题4:Which of the following is the right order of the passage?

a. Charles gave his story to Alice as a Christmas present. 

b. Charles had a picnic with three little girls on the Thames. 

c. Alice's Adventures in Wonderland was first printed in l866. 

d. More parts were added to the story by Charles. 

e. The book won a large number of fans.

A.c-b-a-d-e

B.c-a-b-e-d

C.b-a-d-c-e

D.b-a-c-e-d

题型:实验题

演讲学

题型:实验题

能被碱水解的是( )

A.红景天苷
B.水杨苷
C.胡萝卜苷
D.苦杏仁苷
E.芦荟苷

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