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对于负反馈系统,实轴上的开环极点和开环零点把实轴划分为若干区域,对于其中任一区域,如果其右边实轴上的开环零、极点个数之和为____,则该区域____根轨迹。
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【简答题】Television is another major instrument of communication, permitting us to see as well as to hear the news . A)电视是另一种能听并且能看新闻的重要交流工具。 B)电视是另一种主要的交流工具，它使我们能看到新闻事件的报道并且听得同样清楚。 C)电视对我们来说很重要，我们用它来看节目、...
【单选题】Television is another major instrument of communication, ________ us to see as well as to hear the performer.
A.
permitted
B.
permitting
C.
being permitted
D.
to permit
【简答题】newsreport 2 G Read the questions. Listen to the news report and choose the best answer to each question. 1. What does the news report introduce to us? a. A music instrument in the Middle East. b. A m...
【单选题】Learn MORE than an instrument The classes are for students of all ages. Whether you are interested in learning (or returning to) an instrument, or any of our other exciting classes, here is your place...
A.
It is a phone number.
B.
It is a website address.
C.
It is a password.
【单选题】－Marry doesn’t run very fast today. －Yes, there is_________ with her leg.
A.
anything wrong
B.
nothing wrong
C.
something wrong
D.
wrong something
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