老师给出一个二次函数,甲,乙,丙三位同学各指出这个函数的一个性质: 甲:函数的图

题型:填空题

问题:

老师给出一个二次函数,甲,乙,丙三位同学各指出这个函数的一个性质:

甲:函数的图象经过第一、二、四象限;

乙:当x<2时,y随x的增大而减小.

丙:函数的图象与坐标轴只有两个交点.

已知这三位同学叙述都正确,请构造出满足上述所有性质的一个函数______

考点:二次函数的定义
题型:填空题

阅读理解。

     Young people and old people do not always agree with each other. They sometimes have different

ideas about living, working and playing. But in one program in New York State, adults and teenagers live

together in a friendly way.

     Each summer 200 teenagers and 50 adults are invited to join the program. They live together for

eight weeks as members of a special work group. Everyone works for seven hours a day. They do so

not only to keep busy, but also to find meaning and happiness in work.

     Some teenagers work in the woods or on the farm near the village. Some of them learn to make things

like tables, chairs and something like that and to build houses. It is the adults who teach them to do those.

     There are a few free hours each day and weekends are free, too. During the free hours some of the

teenagers learn to take photos or paint pictures, others sit around and talk, sing or dance. Each teenager

has his own way to spend his free time.

     When people live together,  rules are necessary. In this program the teenagers and the adults make the

rules together.If someone breaks a rule, the problem goes before the whole group. They talk about it and

ask,"What should we do about it?"

     One of the teenagers talks about his experience, "You stop thinking only about yourself, You learn to

think about the group. "

1. In the program in New York State, young and old people _                .

A. teach one another new ways of building houses

B. are friendly to one another

C. do not work together

D. spend a long time together, working as farmers

2. All the members spend some time together every day mainly to _               .

A. learn new skills of farming

B. lead a busy life

C. get used to the life on the farms

D. find value and pleasure in work

3. The last paragraph shows that the teenager thinks his experience in the program is _________.

A. tiring          

B.unpleasant

C. helpful                    

D. boring

4. The best title for the passage is _________.

A. The Rules of Living Together

B. Life in New York State

C. Teenagers in the Special Group

D. Free Hours in the Special Work Group

题型:填空题

病例-对照研究的主要评价指标是()。

A.发病率

B.患病率

C.治愈率

D.RR

E.OR

题型:填空题

扭伤的治则是()

A.通经活络

B.消肿止痛

C.祛风散寒

D.行气止痛

E.调和气血

题型:填空题

研究传染病的传播途径,有利于追踪传染源,控制传染病的发生。

通过粪口传播的传染病有

A.甲型肝炎

B.乙型肝炎

C.丙型肝炎

D.丁型肝炎

E.庚型肝炎

题型:填空题

对采用温差控制的精镏塔,要求进料流量稳定且对塔顶和塔底产品均要求较高。()

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