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【单选题】
If the unit response of a causal discrete LTI system is decreasing monotonically, then a correct statement about the system function’s poles of this system is（ ）
A.
Poles are conjugate complex number located in the left half of the z plane.
B.
Poles are negative real number.
C.
Poles are positive real number smaller than 1.
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【多选题】Generally speaking, _______ ______belong to productive skills.
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listening
B.
speaking
C.
reading
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【单选题】There are two second order causal discrete LTI systems with conjugate complex poles. The poles of system 1 are located in the left half of the z plane, while system 2 in the right half. The correct st...
A.
System 1 is causal and stable, while system 2 is causal and unstable.
B.
The frequency of the unit response of system 1 is higher than that of system 2.
C.
The unit responses of both systems are damping oscillation.
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product-oriented approach
B.
process approach
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genre-based approach
D.
direct method
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Asia-America route
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Asia-Central America route
C.
Asia-South America route
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Atlantic route
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A.
size of related vocabulary
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mastery of grammar
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organization and filtering of ideas
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A.
product-oriented approach
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process approach
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genre-based approach
D.
communicate approach
【单选题】The wrong statement about the zeros and poles of a continuous LTI all-pass system is（ ）
A.
All poles are located in the left half of the s plane, while all zeros are located in the right half of the s plane.
B.
All poles are located in the right half of the s plane, while all zeros are located in the left half of the s plane.
C.
Every pole has a corresponding zero which is mirror symmetrical to it about imaginary axis.
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A.
-0.2±j2 are the poles of this system.
B.
-0.2±j6 are the poles of this system.
C.
-2±j0.2 and -10±j0.2 are the poles of this system.