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【单选题】
直流电动机中电枢的作用是什么,也可称为( )。A.
产生电磁转矩,定子
B.
产生电磁转矩,转子
C.
产生固定磁场,定子
D.
产生固定磁场,转子
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】纯蓝色的霁蓝釉是_______代发明的。
【单选题】We cannot form. a sound opinion without facts, for we need to have factual knowledge______our thinking.
A.
which to base upon
B.
upon which to base
C.
which to be based upon
D.
to base upon which
【单选题】Without facts,we can’t form a correct opinion,for we need to have actual knowledge____ our thinking.
A.
which to be based on
B.
on which to base
C.
which to base on
D.
which to base
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