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【单选题】
在一个4极直流电动机中，N、S表示主磁极的极性，n、s表示换向极的极性。顺着转子的旋转方向，各磁极的排列顺序应为（）A.
N—n—N—n—S—s—S一s
B.
N—s—N—s—S一n一S—n
C.
N—n—S—s—N—n—S—s
D.
N—s—S—n—N—s—S—n
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举一反三
【单选题】Which of the following is a disadvantage of the proscenium stage?
A.
The proscenium stage does not allow for scenery or scene changes.
B.
The people sitting in the back rows cannot hear what the actors say.
C.
The proscenium creates a barrier between the actors and the audience.
D.
Ticket prices are higher for plays produced in proscenium theaters.
【简答题】挤出成型的工艺过程。
【单选题】At which stage is sleep called dozing?
A.
Stage four.
B.
Stage three.
C.
Stage two.
D.
Stage one.
【简答题】挤出成型的工艺过程?
【单选题】Which stage of plasmodium is the stage with pathogenicity?
A.
exo-erythrocytic stage
B.
erythrocytic stage
C.
gametocyte
D.
sporozoite
【简答题】简述挤出成型的工艺过程。
【单选题】Which stage of services is the guide in?
A.
Stage1: Introducing the scenic spot
B.
Stage2: Interpreting the scenic spot
C.
Stage3: Serving along the way of touring
D.
Stage4: Seeing off visitors
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