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【简答题】
已知系统函数 ,要使系统稳定,试确定 k 值的范围 。 系统函数与激励信号无关。 已知某系统当激励 f 1 (t)= d (t) 时,全响应为 y 1 (t)= d (t)+ e -t u (t) ; 当激励 f 2 (t)= u (t) 时 , 全响应为 y 2 (t)=3 e -t u (t) 。 ( 1 )求系统的冲激响应 h (t) 与零输入响应 y x (t) ; ( 2 )求当激励为如图所示的 f (t) 时的全响应 y (t) 。 如图所示电路中,开关 K 闭合已久,在 t=0 时 K 断开,试求电容电压 u C (t) 。
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举一反三
【单选题】Which group chosen to assist the House in its judicial duties?
A.
Life peers
B.
Law Lords
C.
Lords Spiritual
D.
hereditany
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【单选题】Which of the following is NOT mentioned in the third paragraph?
A.
Group work gives pupils the opportunity to learn to work together with others.
B.
Pupils also learn to develop their reasoning abilities.
C.
Group work provides pupils with the opportunity to learn to be capable organiz-ers.
D.
Pupils also learn how to participate in teaching activities.
【单选题】Specialisation and the effort to increase yields have resulted in______.
A.
localised pollution
B.
the shrinking of farmland
C.
competition from overseas
D.
the decrease of biodiversity
【简答题】入侵检测系统的两种基本检测方法是_______检测和________检测。
【单选题】选择填空。 — ______ group is your favorite? — I think H. O. T. ______. [ ]
A.
Which, /
B.
Which, does
C.
What, is
【简答题】入侵检测系统的两种基本检测方法是__________和__________。
【单选题】The medical center couldn't ______ which group the flu virus belonged to owing to the lack of more blood samples.
A.
scan
B.
discern
C.
testify
D.
disclose
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