题干

某同学做《探索弹力和弹簧伸长的关系》的实验时,他先把弹簧放在水平桌面上使其自然伸长,用直尺测出弹簧的原长为l0,再把弹簧竖直悬挂起来,然后用竖直向下的力F拉弹簧下端,测出弹簧的长度为l,把l﹣l0作为弹簧的伸长量x,这样操作,由于弹簧自身重力的影响,最后作出F﹣x图象,可能是下图中图正确的是(   )

A:

B:   

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2012-12-07 10:08:39

答案(点此获取答案解析)

C

同类题5



Monday

8—10 a. m

TECHNOLOGYInformation Technology (IT )—Using the Internet

In this lesson, students learn how to surf the internet safely and effectively. There will also be information about using different search engines. Finally, this lesson teaches students about the best websites to use to continue their education online.

10—12 a. m

ARTS

10:00 a. m

DRAMA

Students learn the play that the teacher gave before class. During this lesson, students will have the chance to act out roles with other students.

11:00 a. m

PAINTING WITH WATERCOLOURS

For most of this term, students learn how to use watercolours properly to make pictures. If the weather is good, the lesson may take place outdoors.


LUNCH

1—2 p. m

SCIENCES Biology/Chemistry

Students can choose which class to attend

In biology this week, the topic is Human Body. Students will learn about how it works.

Alternatively, students can study chemistry. This class takes place in the science lab, and this week students learn about H2and O2

2—4 p. m

SPORTS

2:00 p. m

SIKLLS

Students learn about the skills in a certain sport. We use video to see real action from past games.

3:00 p. m

PRACTICE

After we have picked teams, students will play a short match lasting 45 minutes. This week, the sports are football(for boys) and tennis (for girls)


HOMEWORK

IT— the teacher will give students websites to look up at home (about 30minutes)

Drama –students have to learn a part for the next lesson (about 40 minutes)

Biology/ Chemistry—students have to write a short report of the lesson (about 20 minutes)