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【单选题】
系统的开环传递函数为【图片】，则下列说法不正确的是（ ）A.
只有实轴上存在根轨迹
B.
起点为 -2,-4
C.
渐近线只有一条
D.
没有无限零点
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举一反三
【单选题】Until Aristotle, the concept of _____ has been adressed explicitly.
A.
structure
B.
system
C.
combination
【简答题】引起食品腐败变质的微生物主要是 、 、 。
【单选题】According to the interview, how many stages has the concept of health undergone?
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【单选题】A concept has _____ referring expressions
A.
One
B.
many
C.
a few
D.
none of the above
【单选题】The writer wants to demonstrate that ______ .
A.
Japan has always practiced the concept of quality control
B.
The concepts underlying quality control are extremely important in management
C.
The United states has been unable to apply the concepts of quality control
D.
It is a coincidence that quality control worked in Japan
【单选题】The lesson which gradually filtered through was the simple concept ______ every place has special meanings for the people in it; every place represents the center of the world.
A.
that
B.
which
C.
in which
D.
from which
【单选题】The book NEW CONCEPT ENGLISH has been well received by learners of English ______it helps them to develop their basic English skill.
A.
so that
B.
in that
C.
in which
D.
now that
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