若a>0,b>0,则(a+b)(1a+1b)的最小值是( ) A.2 B.22 C.4

题型:选择题

问题:

若a>0,b>0,则(a+b)(
1
a
+
1
b
)
的最小值是(  )
A.2B.2
2
C.4
2
D.4
考点:基本不等式及其应用
题型:选择题

The one-child policy has been carried out for about 20 years .Most Chinese families have only one child. By the year 2008,the number of only children in China had already been 330 million ,which was about the population of the United States .In the next twenty years ,the only-child generation (一代人) will become the main builders of our society .No one knows how much he or she will change the world .

Only children in families often receive the best care, sometimes ,even get a lot of indulgence .Parents always try their best to satisfy their children’s needs .Those children, who are called “little emperors” ,are in danger of too much love .

However these kids often fell lonely because neither their parents nor their classmates can take the place of a brother or a sister.

It seems that only children are still not ready to do their duty .some elder only children have already graduated from college .But they still depend on their parents .They need a longer time to change for their jobs, because they were brought up in a safe environment. When their parents get older, a couple of only children will have four parents and even more grandparents to look after. It will surely be the biggest problem if they don’t well prepare to face it. 

小题1:What was the population of the U.S.A in the year 2008?

A. About 3, 300, 000.   B. About 330, 000, 000.  C. About 33, 000, 000.

小题2:In this passage the word  “indulgence” means ________.

A. 溺爱             B. 批评               C.指导

小题3: Why do only children feel lonely?

A. Their parents have no time for them.

B. They don’t have free time for activities.

C. They have no brothers or sisters.

小题4:What’s the biggest problem for the family that is made up of two only children?

A. They have to look after four parents and even more grandparents.

B. They they still depend on their parents.        

C. They need a longer time to change for their jobs

小题5:The best title for the passage is ____________.

A. Parents for Only Children  B. The Only-child Generation  C. The Only-child Policy

题型:选择题

选择皮下注射为最佳途径的药物是()

A.庆大霉素

B.安痛定(阿尼利定)

C.百白破疫苗

D.青霉素

E.维生素B12

题型:选择题

对设计投标人的资格审查不包括( )。

A.证书的种类
B.证书级别
C.允许承接的任务范围
D.近几年完成工程项目表

题型:选择题

吹气式液位传感器的量程范围调整是通过节流阀实现的,要求是()。

A.最低液位时,平衡室有微量气泡冒出

B.最低液位时,平衡室有大量气泡冒出

C.最高液位时,平衡室有微量气泡冒出

D.最高液位时,平衡室有大量气泡冒出

题型:选择题

心衰患者静脉输液时应严格控制滴速,防止发生肺水肿。()

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