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【单选题】
剩磁消失而不能发电应重新充磁,直流电源电压应低于额定励磁电压(一般取 100V 左右),充磁时间约为( )。A.
、 1~2mm
B.
、 2~3mm
C.
、 3~4mm
D.
、 4~5mm
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A.
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