mooc答案类别

第1周-第0章 绪论

第1周测试

1、判断题：
‎对于基于金属应变片的柱式力传感器，由于钢柱能够将力转换为钢柱的形变，因此，钢柱是转换元件。‎
选项：
A: 正确
B: 错误
答案: 【 错误】点我阅读全文

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第01周 科学与社会研究

单元测试

1、单选题：
‎下列关于社会现象与自然现象说法不正确的有​
选项：
A: 社会现象可以做假设检验，但很难去做重复检验
B: 自然现象的属性可以测量，而社会现象的属性不可以测量
C: 社会现象同自然现象一样，都是有规律可循的
D: 自然现象可以做重复检验
答案: 【 自然现象的属性可以测量，而社会现象的属性不可以测量】点我阅读全文

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公文格式

公文主体格式

1、单选题：
‏1.公文的标题一般由（    ）组成​‏​
选项：
A: 版头、发文字号
B: 抄送机关、版头、主题词
C: 份号、密级标志、主题词
D: 发文机关名称、事由、文种
答案: 【 发文机关名称、事由、文种】点我阅读全文

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第一章 毛泽东思想及其历史地位

测试题

1、单选题：
‍1925年毛泽东在《中国社会各阶级的分析》中指出，中国过去一切革命斗争成效甚少的主要原因‏
选项：
A: 没有找到革命的新道路
B: 没有扩大民主主义宣传
C: 没有到群众中做实际的调查
D: 没有团结真正的朋友以攻击真正的敌人
答案: 【 没有团结真正的朋友以攻击真正的敌人】点我阅读全文

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第1章 合同法概述

第1章 合同法概述 测验

1、单选题：
根据《合同法》第2条,下列协议中,可适用《合同法》的是 (  )​
选项：
A: 收养协议
B: 合伙协议
C: 结婚协议
D: 离婚协议
答案: 【 合伙协议】点我阅读全文

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第一讲 数据仓库概述（补充内容）

数据仓库基本概念随堂测试

1、单选题：
​OLAP的技术核心是（    ）‏
选项：
A: 数据分析
B: 多维分析
C: 钻取
D: 信息分析
答案: 【 多维分析】点我阅读全文

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Unit 1 preface

Unit 1

1、判断题：
​The island of Great Britain is geographically divided into three parts: England, Scotland and Wales​​​
选项：
A: 正确
B: 错误
答案: 【 正确】点我阅读全文

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第一周 《周易》导读

第一周《周易》导读测验

1、单选题：
‎‍孔子对周易的主要功绩是‍
选项：
A: 撰写易传
B: 撰写卦辞 ‍
C: 撰写爻辞
D: 发明六十四卦
答案: 【 撰写易传】点我阅读全文

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第一章 金属切削过程的基础知识

单元测验

1、单选题：
用Z=20的端铣刀，选n=120r/min、vf=480mm/min，则铣刀每齿进给量是（      ）。‌‎ ‌
选项：
A: 0.1mm  
B: 0.2mm 
C: 0.3mm
D: 0.4mm
答案: 【 0.2mm 】点我阅读全文

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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

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