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How to prepare a lecture Being invited to give a lecture is an honor.It means that people regard you as an authority on a given field, subject, or issue.It means you are worth listening to.小题1: You have to make sure your lecture is interesting, and full of wisdom, from which the audience can take valuable insights.This is why it is important for you to prepare your lecture well. 1.Think of a good topic. You most likely will be assigned to talk about a certain topic.If that's the case, you only need to make an outline and do some research.But in some cases, you will have to think of your own topic.Although it gives you more freedom to do it, thinking of a topic can be tricky.小题2: Or pick a topic that is timely and socially relevant. 2.Make an outline for the lecture. Start by listing down the points that you will discuss, and then fill in each point with subpoints.If necessary, make a research about your topic.小题3: But if in so doing you end up with a very long outline, figure how you can shorten the topic or cut where cutting is needed. 3.小题4: Statistics, figures, medical information, historical accounts, and similar information should all be checked and it will save your credibility as an authority on the subject you are talking about. 4.Add humor. Don't engage your audience in a dragging soliloquy (独白).小题5: Humor will interest your audience.Of course, make sure the elements in your lecture are in line with your main topic and are not nonsense, racial, and offensive jokes. A.Check your lecture for accuracy. B.Giving a lecture is challenging, though. C.If necessary, provide your contact information, such as an email address or blog site. D.Instead, make your audience smile, or burst into laughter at certain points in your discussion. E.To make it easier, consider what will interest your audience. F.It should summarize your whole talk in one sentence. G.Don't be afraid of exploring the topic, as this will allow you to discover other points that need discussion.
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参考答案:
举一反三
【单选题】PDF卡片信息中不包括:
A.
晶胞参数
B.
晶面指数
C.
晶系信息
D.
晶体形貌信息
【单选题】– Let’s go and listen to Mr Smith’s talk on Western culture, shall we? –_______ It’s getting to the end.
A.
Why not?
B.
That’s all right.
C.
I’m afraid not.
D.
Never mind.
【单选题】下面的表格从上到下依次是()。 光敏二极管、光敏电阻、光敏晶体管名称特 点体积小,线性好,温漂小,响应时间可达1μs;可用于光电传感器、光纤通信价廉;线性度差,温漂大,响应慢;可用于100lx以下测量或判断有无光照灵敏度高;线性较好,温漂比光敏二极管大,响应较慢;可用于低速测量
A.
光敏二极管、光敏电阻、光敏晶体管
B.
光敏电阻、光敏二极管、光敏晶体管
C.
光敏二极管、光敏晶体管、光敏电阻
D.
光敏电阻、光敏晶体管、光敏二极管
【单选题】– Let’s go to the cinema this afternoon, shall we? -- ____. I like watching films.
A.
Yes, let’s
B.
No, let’s not
C.
That’s right
D.
That’s all right
【单选题】下面是光敏电阻的应用的是( )
A.
带材跑偏检测
B.
转轴偏心测量
C.
位移测量
D.
称重
【多选题】在一些学校教室为了保证照明条件,采用智能照明系统,在自然光不足时接通电源启动日光灯,而在自然光充足时,自动关闭日光灯,其原理图如图所示.R为一光敏电阻,L为一带铁芯的螺线管,在螺线管上方有一用细弹簧系着的轻质衔铁,一端用铰链固定在墙上可以自由转动,另一端用一绝缘棒链接两动触头.有关这套智能照明系统工作原理描述正确的是( )
A.
光照越强,光敏电阻阻值越大,衔铁被吸引下来
B.
在光线不足时,光敏电阻阻值变大,衔铁被弹簧拉上去
C.
上面两接线柱应该和日光灯电路连接
D.
下面两接线柱应该和日光灯电路连接
【简答题】光电传感器的理论基础是光电效应。通常把光线照射到物体表面后产生的光电效应分为三类。第一类是利用在光线作用下(),这类元件有();第二类是利用在光线作用下()效应,这类元件有光敏电阻;第三类是利用在光线作用下(),这类元件有光电池、光电仪表。
【单选题】以下关于光敏电阻的原理及应用,错误的是( )
A.
光敏电阻应用时需要外部电源,有电流时会发热
B.
光敏电阻在受光照射时的电阻称为亮电阻,此时流过的电流称为亮电流
C.
在光线的作用下,光敏电阻内部电子会逸出物体的表面
D.
光敏电阻的工作原理是基于内光电效应
【单选题】以下光敏电阻的测量方法错误的是:
A.
测量暗电阻时 ,应当 用黑色的布或纸将光敏电阻的受光面完全遮住。
B.
度数为1K时,指针万用表红表笔接的是光敏电阻的正极。
C.
如果测得光敏电阻的亮电阻小于 10K Ω,说明光敏电阻正常
D.
如果测得光敏电阻的亮电阻大于 10K Ω,通常是光敏电阻性能一般或较差。
【判断题】分析仪器的基本组成:样品处理单元、组分分离单元、组分检测单元、检测信号处理和显示单元四个单元。
A.
正确
B.
错误
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