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第一讲初识数据库系统

引言

1、多选题：
‍在数据库界曾经获得过图灵奖学者包括（ ）‎‍‎
选项：
A: Charles W. Bachman
B: Edgar F. Codd
C: James Gray
D: Michael Stonebraker
答案: 【 Charles W. Bachman;
Edgar F. Codd;
James Gray;
Michael Stonebraker】点我阅读全文

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第一周生活中的金融——从各经济主体的财务活动谈起

单元测验

1、单选题：
‎作为现代经济活动中最基本、最活跃的经济部门，企业的财务活动与金融密切相关，其主要表现不包括（）‍
选项：
A: 销售管理
B: 负债管理
C: 资产管理
D: 盈余分配
答案: 【 销售管理】点我阅读全文

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第1讲大数据概述

第1讲大数据概述章节单元测验

1、单选题：
‎第三次信息化浪潮的标志是：‏
选项：
A: 个人电脑的普及
B: 互联网的普及
C: 云计算、大数据、物联网技术的普及
D: 虚拟现实技术的普及
答案: 【 云计算、大数据、物联网技术的普及】点我阅读全文

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第1章 JavaScript初探

JavaScript 的组成

1、多选题：
JavaScript由哪三部分组成（   ）‌‎‌
选项：
A: ECMAScript
B: BOM
C: CSS
D: DOM
答案: 【 ECMAScript;
BOM;
DOM】点我阅读全文

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第一章 哲学与科技的智慧

第一章 哲学与科技的智慧 单元测验

1、单选题：
‌以下不属于轴心文明的是‍
选项：
A: 中华文明
B: 印度文明
C: 希腊文明
D: 玛雅文明
答案: 【 玛雅文明】点我阅读全文

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第1章绪论

ARM处理器的发展书1.1~1.2-随堂测验

1、单选题：
‍以下不是ARM含义的是（）。‎‍‎
选项：
A: 一种高级RISC技术
B: 一个高级RISC（精简指令集）处理器的公司
C: 一种高级编程语言
D: 一类采用高级RISC的处理器
答案: 【 一种高级编程语言】点我阅读全文

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第一周绪论大学语文”概论

第一周单元测试

1、单选题：
​颜回是属于“孔门四科”中哪一科的代表人物？‏
选项：
A: 德行
B: 言语
C: 政事
D: 文学
答案: 【 德行】点我阅读全文

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第一部分会计基础理论，在这部分内容中，将为大家提供14段视频材料。本部分内容为会计的基础理论部分，要求同学们了解会计产生与发生的历程，理解并掌握会计基础职能、定义、会计核算基本前提、记账基础、会计目标、信息质量要求、会计对象、会计要素、会计等式，熟悉会计方法及会计工作程序。

会计基本理论测试

1、单选题：
‍会计的首要职能是（　　　　）‏
选项：
A: 核算
B: 监督
C: 管理
D: 分析
答案: 【 核算】点我阅读全文

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1 创新创业与财商素养概论

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

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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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