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【单选题】
已知单位负反馈系统的开环传递函数为【图片】，系统稳定时K的范围为（ ）。A.
K>70
B.
K<70
C.
K=70
D.
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反馈参考答案：
举一反三
【简答题】everyone are in a good mood. Spring has always been ______
【简答题】The assumption has always been that the two aims were complementary.It has always been ______.
【简答题】The railway station has always been a fascinating place, representing departure as well as ______. (arrive)
【单选题】The English language has always changed, but the rate of change has been uneven.
A.
portion
B.
speed
C.
standard
D.
measure
【单选题】George Washington______.
A.
always will and always has been an American hero
B.
always has and always will an American hero
C.
always has and always will be an American hero
D.
always has been and always will be an American hero
【简答题】Red-light running has always been regarded as a minor wrong, and so it has never been taken seriously. When the violation becomes habitual, however, a great deal more than a traffic problem is involve...
【单选题】As discovered by expedition scientists, Antarctica has not always been so cold as it is today, so has the Arctic.
A.
Right
B.
Wrong
C.
Not mentioned
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