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【单选题】

If the three-phase symmetrical winding is connected with the three-phase three-phase current iA=Im ,iB=Im ,iC=Im , when wt = 210°, the amplitude of the three-phase fundamental wave resultant magnetomotive force is located at ().

A.
A-phase winding axis
B.
B-phase winding axis
C.
C-phase winding axis
D.
A position outside the axis of the three - phase winding
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B.
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C.
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B.
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