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【单选题】
单相交流调压电路的输出电压，如下表述正确的是：A.
晶闸管单相交流调压电路 对晶闸管控制角 a 进行控制，调节输出电压。
B.
晶闸管单相交流调压电路 对晶闸管的导通与周期数进行控制，调节输出电压。
C.
晶闸管单相交流调压电路仅 对晶闸管的导通周期数进行控制，调节输出电压与电流。
D.
晶闸管单相交流调压电路仅 对晶闸管的导通周期数进行控制，调节输出电压与电流以及功率因数。
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