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【简答题】
稳定是对控制系统最基本的要求，若一个控制系统的响应曲线为衰减振荡，则该系统稳定。判断一个闭环线性控制系统是否稳定，在时域分析中采用劳斯判据;在频域分析中采用()
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举一反三
【单选题】【图片】Refer to Figure 4-2. At a price of $4, there is a
A.
surplus of 3 units.
B.
surplus of 6 units.
C.
shortage of 3 units.
D.
shortage of 6 units.
【单选题】Refer to Figure 2 . With trade, Nicaragua
A.
imports 150 calculators
B.
imports 250 calculators
C.
exports 100 calculators
D.
exports 250 calculators
【单选题】Refer to Figure 2-6. What is the opportunity cost to society of the movement from point A to point C?
A.
50 baseballs
B.
100 baseballs
C.
100 bananas
D.
300 bananas Figure 2-6
【单选题】【图片】Refer to Figure 4-2. At a price of $12, there is a
A.
surplus of 1 unit.
B.
surplus of 2 units.
C.
shortage of 1 unit.
D.
shortage of 2 units.
【单选题】Refer to Figure 2 . If the price of the good is $14, then producer surplus is
A.
$17.
B.
$22.
C.
$25.
D.
$28.
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