mooc答案类别

第一章 寻孔颜之乐

寻孔颜之乐

1、单选题：
‍第一个提出寻孔颜之乐问题的学者是‎
选项：
A: 周敦颐
B: 韩愈
C: 程颢
D: 朱熹
答案: 【 周敦颐】点我阅读全文

本文共有 170 人阅读

第一单元 健康与健康教育基本理念

第一单元测验

1、单选题：
‎关于WHO对健康的定义，下列说法正确的是（  ）​
选项：
A: 1947年，WHO将“健康”定义为：身体、心理和社会的健全状态。
B: 1948年，WHO将“健康”定义为：身体、心理和社会的健全状态。
C: 1947年，WHO将“健康”定义为：身体、心理和社会适应的健全状态。
D: 1948年，WHO将“健康”定义为：身体、心理和社会适应的健全状态。
答案: 【 1947年，WHO将“健康”定义为：身体、心理和社会的健全状态。】点我阅读全文

本文共有 161 人阅读

第1章Web技术介绍

第1章测验

1、单选题：
‍什么是动态的网页（    ）。‌
选项：
A: 支持动态效果的
B: 可以运行脚本的
C: 可以交互的
D: 可以看电影的
答案: 【 可以交互的】点我阅读全文

本文共有 109 人阅读

第0章绪论

单元测试

1、单选题：
‎数字信号是时间和（）都离散的信号​
选项：
A: 幅值
B: 振幅
C: 频率
D: 幅度
答案: 【 幅值】点我阅读全文

本文共有 101 人阅读

第一章 国际贸易结算概述（本章内容共3课时，1周学完）

第一章 单元测试

1、单选题：
汇票是由一人向另一人签发的书面的，要求另一个人即期或定期或在可以确定的将来时间，向某人或指定人或持票人支付一定金额的             。​​‍​
选项：
A: 无条件支付命令  
B: 在一定条件下支付的命令
C: 自己承诺付款的命令 
D: 承诺自己付款的承诺
答案: 【 无条件支付命令  】点我阅读全文

本文共有 164 人阅读

第一章 民航运输管理概论

第一章测试题

1、多选题：
​运输任务有哪些要素构成？‌
选项：
A: 载运工具
B: 始发地
C: 目的地
D: 航路
E: 运输对象
答案: 【 载运工具;
始发地;
目的地;
运输对象】点我阅读全文

本文共有 165 人阅读

Lesson 2

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

本文共有 109 人阅读

第一章 会计基础知识（一）

第一章单元测验

1、单选题：
‎会计的基本职能是（    ）。‏
选项：
A: 决策与控制   
B: 分析与考核
C: 核算与监督  
D: 预算与计划
答案: 【 核算与监督  】点我阅读全文

本文共有 114 人阅读

一、机械与人类文明

小节检测

1、单选题：
下列哪一项不是机械为人类带来的正面影响（  ）‏‌‏
选项：
A: 减轻了劳动者的工作负担
B: 提高了人类征服自然、改变自然的信心
C: 使我们的生活方式更为便捷和丰富
D: 促进了科学技术的蓬勃发展，扩大了我们对于宇宙和微观世界的认知
答案: 【 提高了人类征服自然、改变自然的信心】点我阅读全文

本文共有 102 人阅读

第一章货币与货币制度

1.1.4货币的定义和职能随堂测验

1、单选题：
‎实物货币是指（）。​
选项：
A: 没有内在价值的货币
B: 不能分割货币
C: 专指贵金属货币
D: 作为货币其价值预期作为普通商品价值相等的货币
答案: 【 专指贵金属货币】点我阅读全文

本文共有 111 人阅读