mooc答案类别订阅

法人一节测试

1、单选题：
‎代表法人的自然人称为（      ）。‍
选项：
A: 法人代表
B: 法定代表人
C: 法人
D: 代理人
答案: 【 法定代表人】点我阅读全文

第1讲 随堂测验

1、判断题：
‌质量的要求可以是明示的，通常隐含的或必须履行的需求和期望。‎
选项：
A: 正确
B: 错误
答案: 【 正确】点我阅读全文

第一单元 普通话语音概说

1、单选题：
‌语音具有物理属性、生理属性和社会属性。（）是语音的本质属性，是语音区别于其它声音的重要标志。‍
选项：
A: 社会属性
B: 物理属性
C: 生理属性
D: 心理属性
答案: 【 社会属性】点我阅读全文

第1周 单元测验

1、单选题：
下面论述中正确的是 (         )‍‏‍
选项：
A: 在树中，从一个节点到另一个节点不可能有两个不同的路径
B: 图的一个不含回路的子图即为该图的树
C: 作一个图的树时，任何一组支路都可选为树支或连支
D: n个节点连通图，由n-1条支路构成的子图必为树
答案: 【 在树中，从一个节点到另一个节点不可能有两个不同的路径】点我阅读全文

1.1 随堂测验

1、单选题：
‍大篆是指？（单选）‎
选项：
A: 金文，籀文，石鼓文和春秋战国通行于六国的文字。
B: 甲骨文，金文，籀文，石鼓文和春秋战国通行于六国的文字。
C: 籀文，石鼓文和春秋战国通行于六国的文字。
D: 石鼓文和春秋战国通行于六国的文字。
答案: 【 甲骨文，金文，籀文，石鼓文和春秋战国通行于六国的文字。】点我阅读全文

第一章单元测验

1、单选题：

‍

‍选项：
A:
B:
C:
D:
答案: 【 】点我阅读全文

11-1随堂测验

1、单选题：
‎C++语言是从早期的C语言逐渐发展演变而来的，与C语言相比，它在求解问题方法上进行的 ​‎最大改进是（ ）  ​‎​‎​
选项：
A: 面向过程
B: 面向对象 
C: 安全性 
D: 复用性
答案: 【 面向对象 】点我阅读全文

第一章 单元测验

1、单选题：
‎在其它因素不变的情况下，如果商品价格总额增加1倍，则流通中的货币需要量将会________。‎
选项：
A: 增加2倍
B: 减少2倍
C: 增加1倍
D: 减少1倍
E: 不变
答案: 【 增加1倍】点我阅读全文

随堂测验

1、判断题：
‍渣油中的胶质和沥青质对加工过程是有害的，应该全部除去。‌
选项：
A: 正确
B: 错误
答案: 【 错误】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