mooc答案类别订阅

第一章测验题

1、单选题：
‍童话中拟人形象的特点是‎‍‎
选项：
A: “物”就是人，具有人的性格
B: 既具有人的某些特点，又保留物的某些特征
C: 要概括“物”的全部物性
D: 具有超人的神奇能力
答案: 【 既具有人的某些特点，又保留物的某些特征】点我阅读全文

小测验9.1

1、单选题：
‌对于：​int a[] = {5, 15, 34, 54, 14, 2, 52, 72};
int *p = &a[5];‌则：​‌p[-2]的值是？​‌​
选项：
A: 编译出错，因为数组下标越界了
B: 运行出错，因为数组下标越界了
C: 54
D: 2
答案: 【 54】点我阅读全文

历史与文化篇

历史与文化篇第三单元 文化的溯源

第一单元室内吊顶材料与施工工艺 单元测验

1、单选题：
‏矿棉板最大特点是（    ）‍‏‍
选项：
A: 吸音、隔音            
B:  体积大 
C: 材质重
D: 价格便宜
答案: 【 吸音、隔音            】点我阅读全文

工程与伦理单元测验

1、单选题：
‎“志于道，据于德，依于仁，游于艺”中的（  ）可以理解为人生意义上的道。‎
选项：
A: 道
B: 德
C: 仁
D: 艺
答案: 【 道】点我阅读全文

分析质量保证单元测试题

1、单选题：
‍某工厂生产一些化工产品，在生产工艺改进前，产品中杂质含量为0.20%。经过生产工艺改进后，测定产品中杂质含量为0.17%，0.18%，0.19%，0.18%，0.17%。这5次测定平均值为（        ）‏
选项：
A: 0.18%
B: 0.175%
C: 0.17%
D: 0.20%
答案: 【 0.18%】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

第1章测验

1、单选题：

‏如果函数的定义域为[1,2]，则函数的定义域为

​选项：
A: [1,1-ln2]
B: (0,1]
C: [1,e]
D:
答案: 【 】点我阅读全文

营销心理学概述单元测试

1、单选题：
‏标志营销心理学的雏形——广告心理学诞生的书籍为（   ）。​
选项：
A: 《营销心理学》
B: 《广告理论》
C: 《消费者行为》
D: 《消费心理学》
答案: 【 《广告理论》】点我阅读全文

1.证券投资投资工具和证券市场概述

1、单选题：
​下列不属于有价证券的是（）‎
选项：
A: 商品证券
B: 货币证券
C: 资本证券
D: 凭证证券
答案: 【 凭证证券】点我阅读全文