题目内容

利用空间电荷补偿变压器稳定管电流的原理是( )

A. 管电压升高时,提高管灯丝加热电压
B. 管电压升高时,保持X管灯丝加热电压不变
C. 管电压升高时,降低管灯丝加热电压
D. 管电压不时,提高管灯丝加热电压
E. 管电压改变时,保持X管灯丝加热电压不变

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