功率放大器,在分布系统中的主要功能是()。A.主要是功率放大 B.能使信号更加清晰

题型:单项选择题

问题:

功率放大器,在分布系统中的主要功能是()。

A.主要是功率放大

B.能使信号更加清晰

C.有更好的信号过虑作用

D.起到放大及虑波作用

考点:通信工程师室内覆盖系统室内覆盖系统题库
题型:单项选择题

不同的五种商品在货架上排成一排,其中甲、乙两种必须排在一起,丙、丁不能排在一起,则不同的排法共有(  )

A.12种

B.20种

C.24种

D.48种

题型:单项选择题

肾气丸中用量最大的药物是()

A.附子

B.桂枝

C.山萸肉

D.干地黄

E.山药

题型:单项选择题

阅读理解。

     Marking the opening of a new decade, 2010 has brought us many surprises and delights. It has also

delivered its fair share of pain and frustration. Many delivered its fair share of pain and frustration. Many

of the stories and headlines from this year have influenced our lives and left their marks on our vocabulary.

Let's look at some of the year's brief highlights.

     The South Africa's World Cup-vuvuzela

     This was the first World Cup staged on African soil. Before it opened. there were real concerns about

the stadiums. infrastructure and safety. However, all worries disappeared, and for four glorious summer

weeks South Africa became the focus of world attention, along with a global debate over noisy vuvuzela.

     The Chilean miners-promotional video

     On August 5, a Chilean mine accident trapped 33 miners 700 meters under the earth. The 69-day

underground life that followed was the year's global hot suspense drama, feel-good story and soap opera

all rolled into one. The media joked that the live broadcast of miners' release was a great promotional video

for the country.

     The Shanghai World Expo-"gelivable"

     More than 73 million people visited displays by 189 countries and regions at the Shanghai World Expo

which ran from May l to October 31. With the theme of "Better City, Better Life", the Expo boosted

Shanghai's economy and established its reputation as a city of world stature. The spirit of volunteerism was

a highlight of the event. Some 600,000 volunteers were described as "gelivable" (geli) by Internet users.

1. The underlined word "frustration" in Paragraph l means "____".

A. happiness

B. excitement

C. disappointment

D. anger

2. The first paragraph is used as ____.

A. an introduction to the following

B. an example of unusual events in 2010

C. a supporting to the writer's argument

D. a proof to identify the facts

3. The worrying World Cup in South Africa finally turned out to be ____.

A. troublesome

B. noisy

C. tiring

D. successful

4. The world events in 2010 ____.

A. have an impact on our lives and words using

B. have actually a global debate over noisy vuvuzela

C. have led to a hot global suspense drama

D. have been described as"gelivable" by Internet users

题型:单项选择题

冶金生产中大量产生和使用煤气的有高炉煤气、焦炉煤气、转炉煤气、发生炉煤气和铁合金煤气。

题型:单项选择题

文艺复兴首先在意大利兴起的根本原因是()

A.资本主义萌芽最先在意大利出现

B.新兴资产阶级力量的壮大

C.天主教神学对人们思想的束缚

D.意大利有杰出的文化遗产

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