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【简答题】
设控制系统如图所示，其中G c (s)为改善系统性能而加入的校正装置。若G c (s)可从K t S、K a S 2 和K a S 2 /(s+20)3种传递函数中任选一种，你选择哪一种?为什么?
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举一反三
【单选题】The man is going to ________________.
A.
the National Park
B.
the National Bank
C.
the war memorial
D.
o
【单选题】According to the passage, which of the following was a possible motive for the cultivation of plants in eastern North America?
A.
Lack of enough wild food sources
B.
The need to keep trees from growing close to settlements
C.
Provision of work for an increasing population
D.
Desire for the consistent availability of food
【单选题】In the poem “The Motive for Metaphor”, the use of metonymies highlights ____
A.
the interconnection among all human beings
B.
the close relationship between human beings and the natural world
C.
the fragmentation of human experience
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