简述汽轮机油的维护措施？

设f(x)∈C[a，b]，在(a，b)内二阶可导．
1.若f(a)=0，f(b)＜0，f’+(a)＞0．证明：存在ξ∈(a，b)，使得f(ξ)f"(ξ)+f’²(ξ)=0．

Shen Hao was born in 1964. He was the former first secretary of Party branch（原党支部第一书记）of Xiaogang Village, Fengyang County, Anhui Province. He died on November 6, 2009. From 2004 to 2009, he had done many good things for villagers. For the development of Xiaogang Village he had made great contributions. So he was respected by all the villagers.

During the six years, he repaired the village roads, built a building for a number of villagers. He rented a house in the village and thought about how to get the villagers to get rich all day. Even in the New Year, he still got together with his villagers. At last, under his leadership, Xiaogang Village was out of poverty. Now the villagers are leading a rich life.

He is a very filial（孝顺的）son, but he had almost no time to get together with his over 90 year-old mother. But she never complained. His wife works in the bank and she is very busy. They both have little time to look after their daughter.

Although he did not do what he should do to his mother, wife and daughter, all the villagers will remember their good secretary forever.

小题1:Why was Shen Hao respected by all the villagers?

A．Because he repaired roads.

B．Because he built a building for some people.

C．Because he is a filial man.

D．Because he has made great contributions for the development of Xiaogang Village小题2:What did Shen Hao think about all day?

A．He thought about how to mend the road.

B．He thought about how to build houses.

C．He thought about how to make the village rich.

D．He thought about how to get together with his family.小题3:The underlined word “poverty” means________ in Chinese.

A．贫乏

B．贫穷

C．虚弱

D．贫瘠小题4:Which of the following is NOT true according to the passage?

A．Shen Hao was only 45 years old when he died.

B．Shen Hao spent much time in taking care of his daughter.

C．Shen Hao helped the villagers a lot.

D．Now in Xiaogang Village, people are leading a rich life.

如果鼻、咽、喉受感染，其中的病菌可能通过咽鼓管进人中耳，引发（）。

读一读下面的语段，做一做后面的练习。

　　在全班同学的注视下，她终于一摇一晃地走上了讲台。就在英子刚刚站定的那一刻，教室里骤然间响起了掌声，那掌声热烈而持久。在掌声里，我们看到，英子的泪水流了下来。掌声渐渐平息，英子也镇定了情绪，开始讲述自己的一个小故事。她的普通话说得很好，声音也十分动听。故事讲完了，教室里又响起了热烈的掌声。英子向大家深深地鞠了一躬，然后，在掌声里一摇一晃地走下了讲台。

1．写出下列词语的近义词。

骤然——（　　）　　持久——（　　）

2．联系课文分析，我们想通过掌声对英子说些什么？

在英子一摇一晃地走上讲台时，我们热烈的掌声是想告诉英子：____________________

在英子镇定地讲完了故事后，我们热烈的掌声是想对英子说：______________________

3．英子明白我们的心意吗？你从语段中的哪些句子可以看出来？

__________________________________________________________

在面向对象方法中，不属于“对象”基本特点的是______。

A) 一致性
B) 分类性
C) 多态性
D) 标识唯一性