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问题 解答题
把下列各数填入表示它所在的数集的大括号内：
-2.4，3，2.008，-
10
3
，1
1
4
，-0.
•
1
•
5
，0，-（-2.28），-
π
4
，-|-4|
正数集合：{ …}
负有理数集合：{…}
整数集合：{ …}
负分数集合：{ …}．
答案

正数集合：{3，2.008，1

1
4
，-（-2.28）…}；

负有理数集合：{-2.4，-

10
3
，-0.
•
1
•
5
，-|-4|…}；

整数集合：{3，0，-|-4|…}；

负分数集合：{-2.4，-

10
3
，-0.
•
1
•
5
…}．

改错题

Mr. Black,

We're very gladly to have received your money and some reading materials. Thank you very much. We had been studying hard since we came back to school. Under the help of our teachers and classmates, we have made great progresses in our studies. So we often praised and encouraged by our teachers and parents. We have made up our minds to study hard than before to learn every subject good in order to be admitted to key universities in the future.We're looking forward to see you, but we have no chance to go to the Hangzhou ourselves. So we hope you can post us a photo of yours soon.

Best wishes,

Yours,

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问答题 简答题

自动制动阀在各位置中哪几个位置是使制动管减压的机车制动状态如何？
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