在软件生存周期中,能准确地确定软件系统必须做什么和必须具备哪些功能的阶段是( )。

题型:单项选择题

问题:

在软件生存周期中,能准确地确定软件系统必须做什么和必须具备哪些功能的阶段是( )。

A.概要设计
B.详细设计
C.可行性分析
D.需求分析

考点:计算机等级考试C++二级C++笔试
题型:单项选择题

A large part of China experienced larger amounts of smog ( 雾霾 ) than usual this January and the air was badly polluted. The distance ( 距离 ) one could see was shorter than 1,000 meters in Beijing, Tianjin, and the provinces of Hebei, Henan, Shandong and Anhui. In some areas, it was down to 200 meters.

People usually set off firecrackers ( 爆竹 ) to celebrate Spring Festival. But because of the smog, this year seemed very quiet. It was really different. A man called Zhang Wei said that his friends and he hadn’t set off a single firecracker.

“ We all suffered ( 遭受 ) from last month’s smog. If we don’t call an end to the firecrackers, the environment will get worse and worse during the holiday. ” said Zhang Wei. He called on more people to set off fewer firecrackers during this year’s Spring Festival by putting up a notice in his neighborhood.

More Chinese looked forward to celebrating ( 庆祝 ) the holiday in a greener way . They decided not to set off firecrackers. They also decided not to waste food . They said the new celebrations sounded fashionable.

To clean the sky ,more than ten provinces including Guangdong, Zhejiang  and Jiangsu have started to use national 4 standard ( 标准 ), which is expected to reduce ( 减少 ) vehicle emission ( 车辆排放 ) by 30% to 50%. Beijing even has started to use the stricter national standard.

We still have a lot to do to improve the air quality. For example, using public transportation as much as possible is not a hard thing for us to do, but it matters a lot .

小题1: What happened in a large part of China this January?

A.It experienced larger amounts of smog.

B.People set off lots of firecrackers.

C.There was a heavy rain.

D.Many car accidents happened小题2:How do people usually celebrate Spring Festival in China ?

A.By putting up a notice

B.By setting off firecrackers

C.By not wasting food

D.By using public transportation小题3:How many provinces have started to use national 4 standard?

A.Three

B.Six

C.Eight

D.More than ten小题4: Which of the following is Not true according to the passage?

A.Zhang Wei didn’t set off a single firecracker this Spring Festival

B.We should use more public transportation to help reduce the air pollution.

C.Zhejiang has started to use national 4 standard to reduce vehicle emission.

D.More Chinese think the celebration of setting off firecrackers is fashionable.小题5: What’s the best title for the passage?

A.How to reduce the vehicle emission

B.How to improve the air quality

C.What do Chinese do in Spring Festival

D.Using public transportation

题型:单项选择题

下列关于调查设计的叙述,正确的是()

A.明确调查目的是调查研究最核心的问题

B.采用抽样调查还是普查是由该地区的经济水平决定的

C.调查设计出现缺陷时,都可以通过相应的统计分析方法弥补

D.一旦制定了调查研究计划,在实际操作过程中,就不能改变

E.调查的质量控制主要在调查问卷设计阶段

题型:单项选择题

在2008年年初的大雪灾中,许多的输电线路中断,电线杆倒塌或断裂。如图是在抢修输电线路过程中,电工上水泥杆用的脚扣结构图,它由一根钢条做成约3/5的弧状,在前后A、B处绑上橡皮,踏脚板D上有一个固定脚的皮带C,A、B不在同一个水平面上,在竖直方向有一个高度差。下列分析错误的是

[ ]

A.脚扣可等效一个杠杆,B是支点

B.在A、B处绑上橡皮是为了减小摩擦力

C.脚踏板做得宽而大是为了减小脚受到的压强

D.A、B间有一定高度差是为了保证脚扣对水泥杆产生足够的压力

题型:单项选择题

淋巴细胞按其性质和功能可分为几种?

题型:单项选择题

石油中毒引发的肺炎,其恢复时间()。

A、较长

B、短期

C、数年

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