题目内容
（请给出正确答案）
[单选题]
如线路图所示，为异步电动机的工作线路图,该线路图中缺少（)。
如线路图所示，为异步电动机的工作线路图,该线路图中缺少（)。
A.失压保护
B.零压保护
C.过载保护
D.超速保护
提问人：网友grapefruitli
发布时间：2022-01-07
题目内容
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第3题
麦克斯韦速率分布曲线如图所示，图中A、B两部分面积相等，则从该图可看出v0为：（）
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B. v0为平均速率
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第5题
设直流电动机双闭环调速系统的原理线路如图2-18所示。(1)分别求速度调节器和电流调节器的传递
设直流电动机双闭环调速系统的原理线路如图2-18所示。
点击查看答案
(1)分别求速度调节器和电流调节器的传递函数;
(2)画出系统结构图(设可控硅电路传递函数为K3/T3s+1;电流互感器和测速发电机的传递系数分别为K4和K5;直流电动机的结构图用题2-14的结果)
(3)简化结构图，求系统传递函数Ω(s)/Ui(s)。
图2-18直流电动机调速系统原理图
第6题
________ management is the art and science of choosing target markets and getting, keeping, and growing customers through creating, delivering, and communicating superior customer value.
A、Marketing
B、Knowledge
C、Operations
D、Strategic
E、Distribution
第7题
Identify the correct statement about marketing management.
A、It is primarily concerned with the systematic gathering, recording, and analysis of data about issues related to marketing products and services.
B、It focuses mostly on monitoring the profitability of a company's products and services.
C、It focuses solely on attaining an organization's sales goals in an efficient manner.
D、It is defined as the field that deals with planning and managing a business at the highest level of corporate hierarchy.
E、It occurs when at least one party to a potential exchange thinks about the means of achieving desired responses from other parties.
第8题
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A、event
B、property
C、service
D、place
E、idea
第9题
As economies advance, a growing proportion of the economy's activities focuses on the production of ________.
A、products
B、events
C、experiences
D、luxury goods
E、services
第10题
In Walt Disney's Magic Kingdom, customers can visit a fairy kingdom, a pirate ship, or even a haunted house. Disney is marketing a(n) ________.
A、experience
B、service
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