问题 多选题
在《探究弹簧伸长量与弹力关系》的实验中,下列说法中正确的是(  )(不定项选择)

A.测量弹簧原长时应将弹簧平放于水平桌面

B.弹簧竖直悬挂于铁架台的横梁上,刻度尺应竖直固定在弹簧附近

C.在弹簧下端挂钩码时,不能挂太多钩码,以保证弹簧处于弹性限度内

D.若误将弹簧总长为横坐标,弹力为纵坐标,得到的F-l图象,则根据该图象无法得出弹簧的劲度系数

答案

BC

阅读理解

阅读理解。

     On a Friday night, a poor young violinist was playing his violin at the entrance of the sub-way station.

The music was so great that people slowed down to listen and put some money into his hat.

     The next day, the violinist came to the entrance again. He put down his hat as usual. Be-side the hat

was a piece of paper with some words on it. It said, A George Sang has put an important thing into my

hat by mistake.

     "Welcome to claim it." Soon the people were attracted by the words and wondered what it could be.

After a while a man rushed through the crowd, took it! violinist's shoulders and said, "I knew you would

certainly come here." The violinist asked, "Did you lose something?" "Lottery." The violinist took out

lottery ticket with Sang's name on it. Sang took it and danced happily.

     Sang was an office worker. He bought the lottery and won a prize of $500,000. But when he gave $50

to the violinist for his wonderful music, the lottery ticket was thrown in, too. The violinist was a college

student. This morning, he was going to fly to Vienna for high education. However, when he found the

ticket, he cancelled the flight and returned to the entrance.

     Later someone asked the violinist why he didn't take the lottery ticket to pay the tuition fee. He said,

"Although I don't have much money, I live happily. If lose honesty, I won't be happy forever."

1. Why did the young man play the violin at the entrance?

A. For pleasure.

B. To earn money.

C. For love.

2. What did George Sang put into the violinist's hat on a Friday night by mistake?

A. Money.

B. Lottery.

C. Money and lottery.

3. George Sang was very _____ to see the young violinist the next day.

A. worried

B. sorry

C. happy

4. What does the underlined word "cancelled" in the fourth paragraph mean?

A. 增加

B. 取消

C. 上升

5. What's the best title for this passage?

A. The Meaning of Honesty.

B. An Office Worker and a Lottery Ticket.

C. The Wonderful Violin Play.

名词解释