对于二次函数y=(x+1)2-3,下列说法正确的是( ) A.y最大值为-3 B

题型:选择题

问题:

对于二次函数y=(x+1)2-3,下列说法正确的是(  )

A.y最大值为-3

B.y最小值为-3

C.x最大值为-1

D.x最小值为-1

考点:二次函数的最大值和最小值
题型:选择题

某质点的位移随时间的变化规律的关系是:s=4t-2t2,s与t的单位分别为m和s,则质点的初速度与加速度分别为(  )

A.4m/s与2m/s2

B.4m/s与-2m/s2

C.2m/s与4m/s2

D.4m/s与-4m/s2

题型:选择题

可提供对人员、环境的保护,但对产品不能提供保护的生物安全柜是()

A.Ⅰ级和Ⅱ级生物安全柜

B.Ⅰ级生物安全柜

C.Ⅱ级A1型和A2型生物安全柜

D.Ⅱ级B1型和B2型生物安全柜

E.Ⅲ级生物安全柜

题型:选择题

应实行双人验收制度的药品是()。

A.处方药

B.非处方药

C.麻醉药品

D.中药饮片

E.中药材

题型:选择题

阅读理解。

     When I was a child, I often dreamed of the time when I could leave home and escape to the city. We lived

on a farm. In the winter especially, we wear quite out off from the outside world. As soon as I left school, I

packed my bags and moved to the capital. However, I soon discovered that my life has its too.

     One big disadvantage is money. It costs so much to go out, not to mention basics like food and housing.

Another disadvantage is pollution. I suffer from asthma (哮喘), and the air is so that I am afraid to go outside.

Then there is the problem of traveling round. Although I have a car, I seldom use it became of the traffic jams.

One choice is to go by bicycle, but that can be quite dangerous.

     Of course there are advantages. First, there is so much to do in the city, whatever you tastes in culture or

entertainment (娱乐活动). Besides, there are wonderful jobs and greater chances of moving to a more important

job or position. Finally, if you like shopping, the variety of goods is very surprising-and, what is more, shops

are often only a short walk away.

     Is life better then, in the city? Perhaps it is, when you are in your teens (十几岁) or twenties. However, as

you get older, and especially if you have small children, the peace of the countryside may seem preferable. I

certainly hope to move back there soon.

1. What was the writer always thinking about when he was a child?

A. Staying on the farm.

B. Moving to the countryside.

C. Leaving home for the city.

D. Running away from the school.

2. Which of the following is true about the writer?

A. He is very old now.

B. He is in good health.

C. He prefers driving a car.

D. He lives in the city now.

3. In the passage, the writer tries to _____.

A. express his opinions about way of life

B. describe his life in the countryside

C. an interest in the outside world

D. persuade the reader to live in the city

4. How is the passage mainly developed?

A. By inferring.

B. By comparing.

C. By listing examples.

D. By giving explanations.

题型:选择题


考生文件夹中有文件Excel.xls内容如下:


考生文件夹中有文件EXA.xls内容如下:


按要求对此工作表完成如下操作:

将工作表命名为“职工工资情况表”。

更多题库