智慧树慕课答案
1、单选题：
标枪升力的来源的推测，如下那种较为合理？
选项：
A: 升力就是阻力的分力
B: 升力和阻力无关
C: 标枪出手后受到了来自其枪体前下方的空气阻力，由于标枪枪体的存在，其下方空气流动受到枪体的影响，速度较慢，但是枪体上方空气流动较快，导致的压力差是升力的主要来源。
D: 以上都不对
答案: 【 标枪出手后受到了来自其枪体前下方的空气阻力，由于标枪枪体的存在，其下方空气流动受到枪体的影响，速度较慢，但是枪体上方空气流动较快，导致的压力差是升力的主要来源。】点我阅读全文
1、单选题：
线性规划模型不包括下列( )要素。
选项：
A: 目标函数
B: 约束条件
C: 决策变量
D: 状态变量
答案: 【 状态变量】点我阅读全文
1、单选题：
人类的中枢免疫器官包括
选项：
A: 胸腺和骨髓
B: 淋巴结和脾脏
C: 腔上囊和骨髓
D: 胸腺和脾脏
答案: 【 胸腺和骨髓】点我阅读全文
1、单选题：
1947年是谁提出了单纯形法的方法论：
选项：
A: 丹捷格
B: 华罗庚
C: 管梅谷
D: 高斯
答案: 【 丹捷格】点我阅读全文
1、单选题：
Read the following passage about Zoos and answer the questions.Zoos have existed in some form since at least 2500 BC in Egypt and Mesopotamia, where records indicate giraffes, bears, dolphins, and other animals were kept by aristocrats. The oldest still operating zoo in the world, Tiergarten Schönbrunn in Vienna, opened in 1752. Although controversy has historically surrounded zoos, from debates over displaying "exotic" humans in exhibits to zookeepers not knowing what to feed animals, I do believe that zoos should exist. ①In my opinion, zoos are important institutions that promote scientific research and public education, and save animals from extinction.First of all, zoos produce helpful scientific research. Since so many diseases can be transmitted from animals to humans, such as Ebola and the bird flu, zoos frequently conduct disease surveillance research in wildlife populations and their own captive populations that can lead to a direct impact on human health. Take the zoos in the United Stated as an example. In 2017, 173 accredited US zoos spent $25 million on research, studied 485 species and subspecies of animals, worked on 1,280 research projects, and published 170 research manuscripts.②Zoos can also educate the public about animals and conservation efforts. According to a study of 26 zoos worldwide published in Conservation Biology, visitors to zoos increased their knowledge of biodiversity and specific individual actions to protect biodiversity. Robin Ganzert, PhD, President and CEO of American Humane, once stated, "Zoos provide people, especially impressionable children, with the opportunity to see these remarkable animals up close. People won't protect what they don't love, and they can't love what they don't know.” ③It is zoos that give people the chance to appreciate the animals from different corners of the world in real life.In addition, zoos help save species from extinction and other dangers. According to records, there were only nine California condors in the wild in 1985. ④However, a joint conservation effort between the San Diego and Los Angeles Zoos with other organizations resulted in a population of 276 California condors in the wild and another 170 in captivity by 2016. The truth is that zoos are working to save polar bears, tigers, and wild African elephants from habitat loss, apes and rhinos from poachers, dolphins and whales from hunters, and bees and butterflies from population declines, among many other efforts to help many other animals.In conclusion, zoos do bring a lot of benefits to mankind and thus have a reason to exist. No matter in the promotion of scientific research and public education or in the save of animals from extinction, they have indeed made a huge difference. 1. What is the main argument of the author?
选项：
A: Zoos should exist.
B: Zoos help save species from extinction and other dangers.
C: Zoos can promote scientific research and public education, and save animals from extinction.
D: Zoos should exist because they can help promote scientific research and public education, and save animals from extinction.
答案: 【 Zoos should exist because they can help promote scientific research and public education, and save animals from extinction.】点我阅读全文
1、单选题：
贫血（红细胞减少）时，血液的粘滞性（ ）
选项：
A: 先增加后减少
B: 无明显变化
C: 增加
D: 降低
答案: 【 降低】点我阅读全文
1、单选题：
Accounting is an information and measurement system that does all of the following except________.
选项：
A: identifies business activities
B: records business activities
C: communicates business activities
D: does not use technology to improve accuracy in reporting
E: helps people make better decisions
答案: 【 does not use technology to improve accuracy in reporting】点我阅读全文
1、单选题：
在电影《少年派的奇幻漂流》中，派和女生约会的场景片段属于哪种电影技巧的表现？
选项：
A: 镜头
B: 画面
C: 拍摄角度
D: 画面构图
答案: 【 画面构图】点我阅读全文
1、单选题：
不属于电力拖动自动控制系统构成单元的是（ ）。
选项：
A: 电动机
B: 功率放大与变换装置
C: 柴油机
D: 传感器
答案: 【 柴油机】点我阅读全文
1、多选题：
旋转钻井机的基本组成是什么？
选项：
A: 动力系统
B: 循环系统
C: 旋转系统
D: 提升系统
答案: 【 动力系统;
循环系统;
旋转系统;
提升系统】点我阅读全文