老师在黑板上写了14个自然数,让小明计算平均数(保留三位小数),小明计算出的答案

题型:解答题

问题:

老师在黑板上写了14个自然数,让小明计算平均数(保留三位小数),小明计算出的答案是16.387.老师说小数点后第二位错了,其它的数字都对.正确答案应该是多少?

考点:统计(平均数)
题型:解答题

在“探究串联电路的电流特点”实验中,同学们把两个不同规格的小灯泡连接在如图所示的电路中,闭合开关后,发现两灯均发光,但L1较暗,L2较亮。这是为什么呢?他们提出的猜想是:由于L2靠近电源正极,所以流过L2的电流比流过L1的电流大。为了验证猜想是否正确,下面的实验方法是____________________________;最后得出串联电路电流的特点是______________;L2较亮的原因是因为其______________较大。

题型:解答题

“Lately, I have been feeling very stressed and easily lose my temper at people around me,” said Susan Huang. Her troubles are typical of someone her age, according to a survey by the Chinese Academy of Science’s Psychology Institute. In 2000, the institute’s researchers began surveying close to 8,000 people nationwide. People were studied in relation to the pressures they felt during periods of transition.

The results of the survey were released last week, and they make for the interesting reading. For example, people used to take for granted that the older they were, the more pressure they felt.

But, surprisingly, the results have shown that young people in their twenties are the most stressed. This is because young people are forming their values at a time when Chinese society is undergoing great changes, explained Chen Long, a member of the survey team.

“Society is changing and neither their parents nor their teachers can teach them enough to know how to cope with it,” Chen said. Some of them get anxious from the overwhelming amount of information in the wired world, Chen added.

Another problem is that the economic reforms have forced people to develop a more competitive attitude. Those surveyors said they felt more pressure from heavier work-loads, increased peer competition, and greater responsibilities.

Medical disputes and business activities increasingly find their way into people’s free time and simply add to their stress, the survey showed.

Then there is the pressure to achieve more also weighing heavily on people. This is particularly true for those with higher education. Those people really want to acquire new knowledge and use their ability to get ahead and get more out of society.

The researchers hope their survey will throw some light on the state of mental health among the Chinese during this period of major economic and political reforms.

61.Which of the following is one of the reasons for the pressures people felt?

A.people are forming their values.

B.Chinese society is not undergoing a period of transition.

C.The economic reforms have forced young people to develop a more competitive attitude.

D.People with higher education really want to achieve more.

62.What does the underlined word “they” refer to?

A.People getting stressed.               B.The results of the survey.

C.Periods of transition.                 D.The researchers.

63.According to Huang, people with pressure are likely to ____.

A.form their values                    B.achieve more out of society

C.lose their temper                    D.make for interesting reading

64.The purpose of the author in writing this article is to ____.

A.share the state of people with pressure

B.tell us how to deal better with pressure

C.advise people to develop an active attitude to life

D.attract more attention to people’s mental health

题型:解答题

化工自动化系统中,()系统具有被调参数负反馈的闭环系统。

A、自动检测

B、自动信号连锁保护

C、自动调节

D、自动操纵

题型:解答题

胎面上的两条三角嵴斜行相连,称

A.斜嵴
B.横嵴
C.三角嵴
D.边缘嵴
E.牙尖嵴

题型:解答题

男性,21岁。25分钟前左胸部被刀刺伤。就诊时烦躁不安,面色苍白,随后出现意识淡漠。查体:脉搏细弱,血压测不到。左胸第4肋间胸骨旁2cm处可见一长2cm伤口,心音遥远、微弱。最可能的诊断是()

A.心脏贯通伤

B.左侧气胸

C.左侧血胸

D.左侧血气胸

E.胸腹联合伤

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