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【单选题】
理想的频率特性的低频段应该（），以满足稳态误差的要求。A.
有积分环节，开环增益较小
B.
无积分环节，开环增益较小
C.
无积分环节，开环增益较大
D.
有积分环节，开环增益较大
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【简答题】Although they plant trees in this area every ?Although they plant trees in this area every year, the tops of some hills are still _______. A) blank B) hollow C) vacant ...
【单选题】Although they plant trees in this area every year, the tops of hills are still ______.
A.
blank
B.
hollow
C.
vacant
D.
bare
【单选题】Although they plant trees in this area every year, the tops of some hills are still
A.
blank
B.
hollow
C.
vacant
D.
bare
【单选题】Although they plant trees in this area every year, the tops of some hills are still ______.
A.
bare
B.
empty
C.
blank
D.
vacant
【单选题】They plant fruit __________ vegetables on their farm. [ ]
A.
but also
B.
as well as
C.
as well
【单选题】Although they plant trees in this area every year, the tops of some hills are still _____. [ ]
A.
blank
B.
bare
C.
solid
D.
rare
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