下列哪些是衡量直流稳压电源质量的指标()。
A、稳压系数
B、输出电阻
C、纹波电压
D、输出电压的调节范围
参考答案:A, B, C
Attention,please.There______a football game between China and Korea this evening.
A.is going to beB.has beenC.hasD.will have
腊日是指什么?