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【单选题】
若某系统的根轨迹有两个起点位于原点,则说明该系统 ( )A.
含两个理想微分环节
B.
含两个积分环节
C.
位置误差系数为 0
D.
速度误差系统为0
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举一反三
【单选题】The passage tells us that ______.
A.
computers can not yet tell us what symptoms a patient has
B.
computers now can remind you to turn off the lights in the basement
C.
the author has a car that can think for itself
D.
some computers now can already make loud complaints
【简答题】阅读理解。 We are already familiar with computers-computers work for us at home, in offices and in factories. But it is also true that many children today are using computers at schools before they can wri...
【简答题】Text B When the German cruise ship Wilhelm Gustloff was hit by torpedoes (鱼雷) fired from a Russian submarine in the final winter of World War II, more than 10,000 people – mostly women, children and o...
【简答题】阅读理解。 We are already familiar with computers-computers work for us at home, in offices and in factories. But it is also true that many children today are using computers at schools before they can wri...
【简答题】表是1953-2000年江苏人口变化情况。据此回答题 表 年份 总人口（万人） 每百万人中65岁及以上人口占总人口比例（%） 城镇人口占总人口比重（%） 家庭户规模（人） 1953 3767．29 4．49 14．78 4．19 19 4452．21 3．71 14．83 4．09 1982 6052．11 5．55 15．82 3．91 1990 6705．61 6．79 21．24 3．6...
【简答题】任务型阅。 阅读短文，并按要求完成1-5题。 Computers and internet are very important to us now. People like scientists, teachers, writers and even students use computers to do many work. But how many of us know the histo...
【简答题】PASSAGE TWO It was the worst tragedy in maritime history, six times more deadly than the Titanic. When the German cruise ship Wilhelm Gustloff was hit by torpedoes fired from a Russian submarine in th...
【简答题】We are already familiar with computers—computers work for us at home, in offices and in factories. But it is also true that many children today are using computers at schools before they can write. Wh...
【单选题】Families packed into their cars and drove across the country to ______ the new frontier.
A.
investigate
B.
search
C.
explore
D.
inspect
【简答题】It was the worst tragedy in maritime history, six times more deadly than the Titanic. When the German cruise ship Wilhelm Gustloff was hit by torpedoes fired from a Russian submarine in the final wint...
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