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【单选题】
P212,题6.2.1-1:在直流空心线圈中置入铁芯后,如在同一电压作用下,则电流I将怎样变化?
A.
（1）增大
B.
（2）减小
C.
（3）不变
D.
（4）不一定
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A.
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B.
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B.
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C.
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D.
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