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【单选题】
II 型系统跟踪阶跃信号的稳态误差为零,其静态位置误差系数等于( )A.
0
B.
开环放大系数
C.
∞
D.
时间常数
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【简答题】happy . The children sound
【单选题】( )9. The children look _____, because they just played in the park_______. A.happy , happy B. happy, happpily C. happily, happily
A.
happy , happy
B.
happy, happpily
C.
happily, happily
【单选题】From the picture we know, so happy ______that they are wild with joy. [ ]
A.
the children feel
B.
did the children feel
C.
the children are feeing
D.
do the children feel
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【简答题】选择你听到的句子。 ( ) 1. A. The men and women are quick. ( ) 2. A. The children are slow. ( ) 3. A. The car is quick. ( ) 4. A. I am slow. ( ) 5. A. Everyone feels scared. B. They walk qui...
【简答题】Page 118 -Task4 (注意单词全部是小写形式)
【简答题】用所给词的适当形式填空。 1. The children are singing and dancing ____(happy) on the playground. 2. We enjoyed _________( oneself) in the park last Sunday. 3. The workers ________ ( produce) a new kind of machine....
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