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【简答题】
PLC的基本组成结构主要包括电源、 、 和输入/输出接口电路。
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举一反三
【单选题】Air pollution is the most serious problem caused by the exist of too many private automobiles.
A.
Y
B.
N
C.
NG
【简答题】A．It is a social fact. B．It doesn't exist. C．It is natural. D．It is a problem, especially to young people:
【单选题】8) ______, we need to seek professional help. A) When we cannot identify our problem B) If the four-step formula doesn’t work C) When our complex problem continues to exist D) If we want to solve our ...
A.
When we cannot identify our problem
B.
If the four-step formula doesn’t work
C.
When our complex problem continues to exist
D.
If we want to solve our problem more quickly
【简答题】When ______, the problem of unemployment will arise.
【简答题】When you eat out the language problem is ______ .
【单选题】Scarcity would cease to exist as an economic problem if:
A.
we learned to cooperate and not compete with each other.
B.
there were new discoveries of an abundance of natural resources.
C.
output per worker increased.
D.
none of the above.
【简答题】简述 泥浆护壁成孔灌注桩中护筒的作用是什么？
【单选题】What problem does the author think exist within education?
A.
That disciplines are taught as separate subjects
B.
That it doesn’t prepare students for the jobs of today and the future
C.
That there exist ‘silos’ within education
D.
All of the above
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