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近期考題
6. Which of the following statements are true?
(A) Given the characteristic equation 3s2+ 5s+k = 0 of a linear control system, increasing the value of k will decrease the frequency of oscillation of the system.
(B) 
can be approximated by 
since the pole at -20 is much larger
than the dominant poles at O and -1.
(C) For a stable open-loop system with a perfect model P(s), it is always possible to have a stable and causal
feedforward controller F(s) such that P(s)F(s) = 1.
(D) The maximum overshoot of 
is possibly exceed 100 percent when 
and T
are all positive.
(E) If a unity-feedback control system type is 2, then it is certain that the steady-state error of the system
to a step or a ramp input will be zero.
(A)甲＞丙＞乙
(B)乙＞甲＞丙
(C)甲＞乙＞丙
(D)丙＞甲＞乙
17 下表為兩家廠商在短期的生產與成本資料，下列敘述何者正確？ 
(A)A 廠商的固定成本比 B 廠商高
(B)產量小於 3 時，A 廠商的平均成本都比 B 廠商高
(C)對應每一個產量，A 廠商的邊際成本都比 B 廠商高
(D)A 廠商在整個產量範圍中，平均成本隨產量增加而遞減
1. 請自下方答案欄中，選出底下 1 至 5 題合理答案代號，填入題後空格中。
(每一題目可能一個或多個答案，同一答案可能出現在不同題目)
參考答案欄:
【題組】(5) 空氣汙染物中氣狀汙染物之處理單元。答案代號:______
