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【单选题】
关于自感现象,正确的说法是:( )A.
感应电流一定和原电流方向相反
B.
线圈中产生的自感电动势较大的其自感系数一定较大
C.
自感电动势总是阻碍原来电流的变化
D.
对于同一线圈，当电流变化越大时，线圈中产生的自感电动势也越大
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