在测量铁块的密度时，用了下面几个步骤，则测量步骤合理顺序是①计算铁块的体积；②记录铁块放入量筒后水面上升到的刻度；③观察量筒中水的体积；④用天平测出铁块的质量；⑤调节好天平；⑥计算铁块的密度．_刷题宝

题干

在测量铁块的密度时，用了下面几个步骤，则测量步骤合理顺序是（　　）

①计算铁块的体积；②记录铁块放入量筒后水面上升到的刻度；③观察量筒中水的体积；

④用天平测出铁块的质量；⑤调节好天平；⑥计算铁块的密度．

A：⑤④②③①⑥

B：④⑤③②①⑥

C：③②①⑤④⑥

D：⑤④③②①⑥

上一题下一题 0.0难度选择题更新时间:2017-05-02 06:36:19

答案(点此获取答案解析）

D

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Questionnaire
Read the questions and answer Yes or No , then you will find out how good you are.
1. When you don’t understand something, you ask questions.
2. You like listening to older people talk about the past.
3. You think that you can learn something interesting from everyone around you.
4. You are brave enough when you have to talk to people you don’t know.
5. You enjoy reading books about famous people.
6. You always see and talk to different people.
7. You are interested in learning new ways of doing things.
8. You enjoy sharing experiences with friends and learning from people of all ages.
9. You talk a lot about yourself.
10. Even if you are often wrong, you make your own decisions.
11. You hate teaching what you are good at: sports, technology, whatever.
12. Your parents don’t understand you, so you don’t talk to them much.

SCORE NOW!
Score 2 points if you answer YES to each of the first 8 questions, and 0 if you choose NO.
Score 2 points if you answer NO to each of the last 4 questions, and 0 if you choose Yes.
18-24 You are friendly and open-minded. You make people feel important by listening to what they have to say. You’ll probably succeed in learning all kinds of interesting things. Good for you!
10-16 Remember that every single person you know can teach you something. You will greatly make your life rich and colorful.
0-8 About 400 years ago, a famous writer wrote , “No man is an island.” This is still true today. Try to be more open and interested in people around you.

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地球上昼夜交替现象产生的原因是（）

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