晶闸管的额定电压为（）。
A.正向重复峰值电压
B.反向重复峰值电压
C.正反向重复峰值电压中大者
D.正反向重复峰值电压中小者
参考答案：D
— She has gone abroad，______?
—No. She is still teaching us English at our school now.
A．is she
B．isn’t she
C．has she
D．hasn’t she
动态功率控制在整个信号覆盖范围内都可以进行调整。
