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【单选题】
The signal flow graph of a system is shown as figure. The system function of this system is（）
A.
B.
C.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】A higher order system is implemented by the cascading or paralleling of several sub-systems. If we want the poles of the original system is same as those of the sub-systems, then we can adopt the（ ）
A.
cascading only.
B.
paralleling only.
C.
cascading or paralleling.
【单选题】A higher order system is implemented by the cascading or paralleling of several sub-systems. If we want the zeros of the original system is same as those of the sub-systems, then we can adopt the（ ）
A.
cascading only.
B.
paralleling only.
C.
cascading or paralleling.
【判断题】Drawing mind-map based on the text is one form of information transferring activity. ()
A.
正确
B.
错误
【单选题】If a second order LTI continuous system has step response as shown as figure, then the poles of its system function are（ ）
A.
two negative real poles.
B.
a pair of conjugate poles in the right half of the s complex plane.
C.
a pair of conjugate poles in the left half of the s complex plane.
【判断题】As of 2018, the EU has been China’s largest trading partner for 15 consecutive years
A.
正确
B.
错误
【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.
【多选题】Generally speaking, _______ ______belong to productive skills.
A.
listening
B.
speaking
C.
reading
D.
writing