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【简答题】
2-12:有一个晶闸电动机调速系统,已知:电动机 , , , , ,整流装置内阻 Ω,电枢回路电抗器电阻 Ω ,触发整流环节的放大倍数 。 (1)系统开环工作时,试计算调速范围D=30时的静差率s; (2)当D=30, 时,计算系统允许的稳态速降; (3)如组成转速负反馈有静差调速系统,要求D=30, ,在 时, , ,计算转速负反馈系数 和放大器放大系数 。
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反馈参考答案：
举一反三
【简答题】词组:因此,结果
【单选题】Servlet间协作不发生在:
A.
在一个Servlet处理完毕后，将客户端的请求传递到另外一个Servlet来处理
B.
forward(转发)
C.
include(包含)
D.
sendRedirect重定向
【简答题】请简述透视图的分类及应用?
【简答题】结果,因此 词组
【单选题】The author argues that the main cause of aged societies is
A.
the increase in birthrate.
B.
the drop in death rate.
C.
as much the growth in birthrate as the decline in death rate.
D.
not so much the decrease in death rate as the fall in birthrate.
【简答题】Huntington argues that Davos Man's global-citizen
self-image is starkly at odds with the
values of most AmericansA. in disagreement with B. beyond explanation C. strangely D. like
【单选题】The author argues in paragraph 3 that payments for ecosystem services may bring______.
A.
the full privatization of land
B.
the robbery of common resources
C.
the rational exploitation of natural resources
D.
desirable ecosystem services
【单选题】The author argues that the social insurance system should_______.
A.
provide benefits for the old, sick and unemployed
B.
encourage people to take on more social obligations
C.
guarantee everybody the right to be employed
D.
provide everyone the right to a minimum subsistence for a certain period
【单选题】Political scientist Samuel Huntington argues that modernization in non-Western societies can result in a retreat toward the traditional. This is exemplified by _____.
A.
the Islamic resurgence
B.
the popularization of modern gadgets
C.
the adoption of Western culture
D.
the higher levels of literacy and education
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