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【简答题】
振荡环节的相频特性 θ(ω) ,当ω →∞ 时,其相频特性为( )
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举一反三
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【单选题】The boss sent Mr Black to China on business because ______.
A.
Mr Black had never been to China before
B.
Mr Black was an able and hardworking man
C.
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