第一章 总论

1.1

1、单选题:
‏管理会计是向企业管理当局提供与        等相关的信息的会计信息处理系统。‏‏‏
选项:
A: 计划、控制、决策、考核
B: 计划、控制、执行、考核
C: 计划、决策、执行、考核
D: 计划、控制、决策、执行
答案: 【 计划、控制、决策、考核点我阅读全文

第一周 绪论 “大学语文”概论

第一周 单元测试

1、单选题:
‌在《论语·先进》“子路曾皙冉有公西华侍坐章”中,孔子最为赞同的弟子是哪一位?‎
选项:
A: 曾皙
B: 子路
C: 冉有
D: 公西华
答案: 【 曾皙点我阅读全文

第1章 概述(第1周)

第1周 单元测验1

1、单选题:
‍Arduino这个最经典的开源硬件项目,诞生于(      )。‎
选项:
A: 美国
B: 英国
C: 意大利
D: 法国
答案: 【 意大利点我阅读全文

第二周

第二周 极限的运算测试题A

1、单选题:

‏极限

‎选项:
A: 5
B: 4
C: -5
D: 不存在
答案: 【 5点我阅读全文

第一周函数(一)

小测验1:

1、单选题:
‎C语言是由( )构成。​
选项:
A: 主程序和子程序
B: 主函数和子函数
C: 一个主函数和若干功能函数
D: 主函数和子程序
答案: 【 一个主函数和若干功能函数点我阅读全文

第六章 个案社会工作

个案基本概念

1、单选题:
‏根据美国心理学家伊根的理论,社会工作者属于()。‍
选项:
A: A.第四级的助人者
B: B.第三级助人者
C: C.第二级助人者
D: D.第一级助人者
答案: 【 D.第一级助人者点我阅读全文

第1章 直流电路与电路分析方法

电路的分析方法

1、单选题:

电路如图所示,电压Uab=(                    )V


         

‏选项:
A: 0V        
B: +6 V         
C:  -6 V              
D: 3V
答案: 【  -6 V              点我阅读全文

第10讲 BigDat&AI技术篇06-机器学习中的基本线性代数

单元测试1

1、单选题:

计算

‍选项:
A:
B:
C:
D:
答案: 【 点我阅读全文

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