mooc标签存档

第1讲 电力系统自动化概述和自动装置设计

电力系统自动化概述和自动装置设计的单元测验

1、单选题：
‏在电力系统分析中，主要研究故障后100毫秒内电力系统行为的过程是（）​
选项：
A: 电力系统稳态运行过程
B: 电力系统长期稳定性过程
C: 电力系统电磁暂态过程
D: 电力系统小扰动稳定过程
答案: 【 电力系统电磁暂态过程】点我阅读全文

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第6章 长期股权投资

第6章 长期股权投资 单元测试

1、单选题：
‍长江公司以定向发行自身普通股的方式取得了黄河公司20%的股权，能够对黄河公司实施重大影响。已知，长江公司发行的股票数量为20万股，每股公允价值为22元，面值为1元。为增发该部分股票，长江公司另向证券承销机构支付了20万的佣金和手续费。当日，黄河公司可辨认净资产的公允价值为5000万元，账面价值为4500万元。假定不考虑其他因素，长江公司取得该项股权投资应确认的资本公积为（　　）万元。‍
选项：
A: 460
B: -20
C: 400
D: 420
答案: 【 400】点我阅读全文

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Lesson2

Scanning

1、单选题：
‏Read the passage "The Discovery of X-rays" quickly and choose the paragraph(s) which contain(s) the answer(s). You may choose more than one answer for question 3. ‌‏‌The Discovery of X-rays‌‏ ‌Par. 1 Except for a brief description of the Compton effect, and a few other remarks, we have postponed the discussion of X-rays until the present chapter because it is particularly convenient to treat X-ray spectra after treating optical spectra. Although this ordering may have given the reader a distorted impression of the historical importance of X-rays, this impression will be corrected shortly as we describe the crucial role played by X-rays in the development of modern physics.‌Par. 2 X-rays were discovered in 1895 by Roentgen while studying the phenomena of gaseous discharge. Using a cathode ray tube with a high voltage of several tens of kilovolts, he noticed that salts of barium would fluoresce when brought near the tube, although nothing visible was emitted by the tube. This effect persisted when the tube was wrapped with a layer of black cardboard. Roentgen soon established that the agency responsible for the fluorescence originated at the point at which the stream of energetic electrons struck the glass wall of the tube. Because of its unknown nature, he gave this agency the name X-rays. He found that X-rays could manifest themselves by darkening wrapped photographic plates, discharging charged electroscopes, as well as by causing fluorescence in a number of different substances. He also found that X-rays can penetrate considerable thicknesses of materials of low atomic number, whereas substances of high atomic number are relatively opaque. Roentgen took the first steps in identifying the nature of X-rays by using a system of slits to show that (1) they travel in straight lines, and that (2) they are uncharged, because they are not deflected by electric or magnetic fields.‌Par. 3 The discovery of X-rays aroused the interest of all physicists, and many joined in the investigation of their properties. In 1899 Haga and Wind performed a single slit diffraction experiment with X-rays which showed that (3) X-rays are a wave motion phenomenon, and, from the size of the diffraction pattern, their wavelength could be estimated to be 10-8 cm. In 1906 Barkla proved that (4) the waves are transverse by showing that they can be polarized by scattering from many materials.‌Par. 4 There is, of course, no longer anything unknown about the nature of X-rays. They are electromagnetic radiation of exactly the same nature as visible light, except that their wavelength is several orders of magnitude shorter. This conclusion follows from comparing properties 1 through 4 with the similar properties of visible light, but it was actually postulated by Thomson several years before all these properties were known. Thomson argued that X-rays are electromagnetic radiation because such radiation would be expected to be emitted from the point at which the electrons strike the wall of a cathode ray tube. At this point, the electrons suffer very violent accelerations in coming to a stop and, according to classical electromagnetic theory, all accelerated charged particles emit electromagnetic radiations. We shall see later that this explanation of the production of X-rays is at least partially correct.‌Par. 5 In common with other electromagnetic radiations, X-rays exhibit particle-like aspects as well as wave-like aspects. The reader will recall that the Compton effect, which is one of the most convincing demonstrations of the existence of quanta, was originally observed with electromagnetic radiation in the X-ray region of wavelengths.‌‏‌‏When were X-rays discovered?‌
选项：
A: Par. 1
B: Par. 2
C: Par. 3
D: Par. 4
E: Par. 5
答案: 【 Par. 2】点我阅读全文

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第1讲分析化学实验概述

单元测试1分析化学实验概述

1、单选题：
‏定量分析方法按取样量不同，可分为常量、微量、半微量、超微量等。其中常量分析的试样量为（  ）。‎
选项：
A: >0.1 g或>10 mL
B: <0.1 mg或<0.01 mL
C: 0.1～0.01 g或1～10 mL
D: >0.5 g或>35 mL
答案: 【 >0.1 g或>10 mL】点我阅读全文

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第二讲 静力学公理及常见约束

约束和约束力单元测试

1、单选题：
‎以下说法中错误的是(  )​
选项：
A: 理论力学是研究物体机械运动一般规律的科学。
B: 理论力学与物理中力学部分的主要区别在于理论力学的研究对象和研究方法更加面向工程实际。
C: 刚体是理论力学中的重要概念，理论力学的研究对象只能是刚体。
D: 静力学五个公理是导出静力学中其他定理和定律的基础。
答案: 【 刚体是理论力学中的重要概念，理论力学的研究对象只能是刚体。】点我阅读全文

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第一讲生物过程设计概况

第一讲单元测验

1、多选题：
‌生物过程设计主要包括哪些内容？‌
选项：
A: Flowsheet Design
B: Process Optimization
C: Bottlenecking Analysis
D: Economic Evaluation
E: Environmental Assessment
答案: 【 Flowsheet Design;
Process Optimization;
Bottlenecking Analysis;
Economic Evaluation;
Environmental Assessment】点我阅读全文

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01景观设计概述

随堂测验1

1、判断题：
‏风景园林是一门融艺术、科学、技术的综合性学科，从事风景 园林的人，必须有广博的知识以及相当的实践经验，方能胜任。​
选项：
A: 正确
B: 错误
答案: 【 正确】点我阅读全文

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第一章药事法规概述

第一章药事法规概述单元测验

1、单选题：
‎下列商品中，按照药品管理的是( )‌‎‌‌‎‌
选项：
A: 开颜创可贴，注册证号为“浙金食药监械（准）字2013第1640019号”
B:  呋喃西林贴，注册证号为“国药准字H45021067”
C: 邦迪防水创可贴，注册证号为“沪食药监械（准）字2009第1640263号”
D: 海氏海诺创可贴，注册证号为“鲁食药监械（准）字2013第1640064号”
答案: 【  呋喃西林贴，注册证号为“国药准字H45021067”】点我阅读全文

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第2章电磁波及遥感物理基础下

第二章单元测验

1、单选题：
‍大气散射中瑞利散射的强度与以下哪项有关：‏
选项：
A: 与波长的一次方成反比
B: 与波长的二次方成反比
C: 与波长的三次方成反比
D: 与波长的四次方成反比
答案: 【 与波长的四次方成反比】点我阅读全文

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第一章 认识篇

4.课程测试

1、判断题：
‍将两个以上的色彩元素，根据不同的目的性，按照一定的构成原理和形式美法则，重新组合搭配，构成理想而又富于美感的色彩关系，这种对色彩的创造过程和结果，就是色彩构成。‍‍‍
选项：
A: 正确
B: 错误
答案: 【 正确】点我阅读全文

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