mooc答案类别订阅

第一讲测验

1、单选题：
​杨老师在自己的课上将学生分成若干个小组，并采用任务教学的方式组织课堂，同一小组的学生需要完成相应的学习任务，学生最终得分则取决于小组任务的完成情况，杨老师希望通过这种方式帮助同组内的学生建立何种互赖关系？‎
选项：
A: 积极的相互依赖
B: 竞争的相互依赖
C: 无相互依赖
D: 消极的相互依赖
答案: 【 积极的相互依赖】点我阅读全文

创新创业与财商素养概论单元测试

1、单选题：
（      ）是一个发现和捕获机会并由此创造出新颖的产品、服务或实现其潜在价值的过程。‎
选项：
A: 创新
B: 创业
C: 创造
D:  创作
答案: 【 创业】点我阅读全文

01 心理学工作伦理与督导概论 单元测验

1、单选题：
‌“在督导过程中，保障来访者的利益，不让来访者受到伤害。”体现了伦理总则的哪一项原则？‎
选项：
A: 善行 
B: 责任
C: 诚信 
D: 尊重
答案: 【 善行 】点我阅读全文

第一章单元测验

1、单选题：

‏若，则

‍选项：
A: 4.
B: -4.
C: 8.
D: -8.
答案: 【 -8.】点我阅读全文

4.3 平面力偶系自测题

1、单选题：
‍平面力偶系的平衡方程是（    ）。‏
选项：
A:
B:
C:  
D:
答案: 【 】点我阅读全文

1.1 随堂测验

1、判断题：
‏哲学思维对于人工智能的重要性表现在,哲学所强调的批判性思维有助于认清人工智能发展中的问题。‎
选项：
A: 正确
B: 错误
答案: 【 正确】点我阅读全文

第一单元测验

1、单选题：
‎以下哪一个是采购管理对企业经营成功的直接作用（  ）​‎A产品标准化​‎B降低成本​‎C减少库存​‎D对产品设计的贡献​
选项：
A: 产品标准化
B: 降低成本
C: 减少库存
D: 对产品设计的贡献
答案: 【 降低成本】点我阅读全文

第一章单元检测

1、单选题：
‏叶绿素强烈吸收的波段是？‏
选项：
A: 微波波段
B: 可见光波段
C: 近红外波段
D: 紫外波段
答案: 【 可见光波段】点我阅读全文

1.1有机化合物和有机化学随堂测验

1、单选题：
‍下列化合物中，不是有机化合物的是（        ）  ‌
选项：
A: 叶绿素
B:  氯仿   
C: 尿素  
D:  氨气
答案: 【  氨气】点我阅读全文

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