如图管道串联,管道直径分别为d1=2d2=3d3,3点流量为Q3,各管的雷诺数之比R

题型:单项选择题

问题:

如图管道串联,管道直径分别为d1=2d2=3d3,3点流量为Q3,各管的雷诺数之比Re1:Re2:Re3为()。

A.1:2:4

B.1:2:3

C.2:3:3

D.1:1:2

考点:注册公用设备工程师暖通空调专业知识管道计算
题型:单项选择题

树上、树下各有一群小猴子在玩耍,如果树上的猴子下到树下一只,则两群猴子数量相等;如果树下的猴子到树上一只,则树上的猴子只数是树下的3 倍,树上、树下各有几只小猴子?

题型:单项选择题

阅读理解。

     In 1890 William James, the American philosopher and physician and one of the founders of modern

psychology, defined psychology as"the science of mental life" and this definition provides a good starting

point for our understanding even today. We all have a mental life and therefore have some idea about what

this means, even though it can be studied in rats or monkeys as well as in people and the concept remains

difficult to understand.

     Like most psychologists, William James was particularly interested in human psychology, which he

thought consisted of certain basic elements: thoughts and feelings, a physical world which exists in time

and space, and a way of knowing about these things. For each of us, this knowledge is primarily personal

and private" It comes from our own thoughts, feelings and experience of the world, and may or may not

be influenced by scientific facts about things. For this reason, it is easy for us to make judgments about

psychological matters using our own experience as a standard. We behave as amateur psychologists when

we offer opinions on complex psychological phenomena. However, problems arise when two people

understand these things differently. Formal psychology attempts to provide methods for deciding which

explanations are most likely to be correct, or for determining the circumstances under which each applies.

The work of psychologists helps us distinguish between inside information, which is subjective, and may

be prejudiced and unreliable, and the facts: between our predictions and what is"true" in scientific terms.

     Psychology, as defined by William James, is about the mind or brain, but although psychologists do study

the brain, we do not understand nearly enough about its workings to be able to comprehend the part that it

plays in the experience and expression of our hopes, fears, and wishes, or in our behaviour during experiences

as varied as giving birth or watching a football match. Indeed, it is rarely possible to study the brain directly.

So, psychologists have discovered more by studying our behaviour, and by using their observations to obtain

hypotheses (假设) about what is going on inside us.

1. The first paragraph is mainly about _____.

A. the founder of modern psychology

B. the definition of psychology

C. the complexity of psychology

D. the influence of psychology

2. From Paragraph 2, we can know that problems arise because _____.

A. of the difference between inside information and the facts

B. of different thoughts and feelings about psychology

C. people usually make judgments based on their own ideas

D. amateur psychologists cannot use scientific terms

3. According to the passage, psychologists study the brain mainly _____.

A. in a direct way

B. with their own experience

C. by observing how it works

D. by watching people's behaviour

4. Which of the following can be the first sentence in the fourth paragraph?

A. Psychology is also about the ways people use their mental abilities to operate in the world around them.

B. William James is considered to be the greatest psychologist in the 1890s.

C. Psychology suggests that living beings adapt to a changing environment so that they can survive.

D. It is important for psychologists, as well as ordinary people, to be aware of the reasons.

题型:单项选择题

如图是人体血液循环模式图.请据图分析回答有关问题:

(1)肺循环结束后,血液所发生的变化是:______.

(2)体循环的起、止点分别是:______.

(3)血液流经[4]肠进入[5]肝时,血液成分的特殊变化是:______.

(4)血液经[3]肾脏流出时,血液成分的特殊变化是:______.

(5)饭后血糖浓度一般会升高,这时的胰岛素起什么作用?______.

题型:单项选择题

C.下列关于食品安全标准特点的描述中,正确的是().

A、科学性、可靠性、渐进性、强制性;

B、地方性、可靠性、前瞻性、强制性;

C、科学性、可行性、前瞻性、实用性;

D、多样性、复杂性、实用性、强制性。

题型:单项选择题

为了实现数据终端设备之间的通信,在通信网络中必须设置交换中心,以便为需要通信的数据终端建立通信链路,通信结束后再拆除链路。目前在视频会议中使用的交换技术主要是:

A.报文交换

B.电路交换

C.分组交换

D.信元交换

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