下列实数中，-17、311、π2、-3.14，25、0、3-27、0.32322_爱下问搜题

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问题填空题

下列实数中，-

1

7

、

3	11

、

π

2

、-3.14，

25

、0、

3	-27

、0.3232232223…（相邻两个3之间依次增加一个2），有理数的个数是______个．

答案

-

1

7

是有理数，

3	11

是无理数，

π

2

是无理数，

-3.14是有理数，

25

=5是有理数，

0是有理数，

3	-27

=-3是有理数，

0.3232232223…是无理数，

所以，有理数有5个．

故答案为：5．

完形填空

阅读下面短文，掌握其大意，然后从21----40各题所给的4 个选项（A、B、C和D）中，选出最佳选项。
A farewell party was going on. Sylvia Calver hated being the center of any pubic show where she didn’t know anyone. It made her 36 hot and she always felt she wanted to go away somewhere. But on an occasion like this when she knew 37 , there was no 38 to feel shy. 39she had made up her mind to 40 people’s attention for once in her life. Unlike others, Sylvia didn’t have any sad feelings herself at leaving Palmeira Court Hotel or saying goodbye to its 41 — she had left so many other 42 , and known too many people in her life to get upset by such things now.
Yet this 43 was a particular occasion, and she hadn’t had so many of those in her 44. She had put on her 45 black dress and her long earrings. She had wanted to enjoy being the center of 46 for one evening, but now they had 47 old Miss Hutton of all people to give the 48 speech, whom she disliked. Even so, she thought there was no sense in getting 49 about it, for it was the first rule her 50 had given her — avoid all anxiety, take things easy. So, surprising herself by enjoying her own well-rounded white arm as 51 showed through the sleeve of her 52 dress, she took a taste of her drink and then sat back comfortably with her cigarette. And her doctor’s orders worked! For 53 out slowly, she put Miss Hutton off the end of her 54 with a cloud of tobacco smoke, so that she smiled to herself at the old girl’s funny expression. She 55 herself quite well that night, even to her own surprise.

D．performance

多项选择题

变速器的技术要求是（）。

A.换档时齿轮啮合灵便

B.不得有乱档和自动跳档现象

C.换档时变速杆不得与其他部件干涉

D.运行中无异响