标准正弦波电压信号<img src="https://static.zxtiku.com/wangke/imgs/topic/129c518c20eb91e09a28ffd552834203.jpg"/>和整流三角波电压信号<img src="https://static.zxtiku.com/wangke/imgs/topic/54b8427de0f3b0e3d4db509620fce3f7.jpg"/>之间有效值关系是（）<img src="https://static.zxtiku.com/wangke/imgs/topic/ca1751adcd6ee24cead12eb1cf75d100.jpg"/><br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/7630547ba1a722da67f3fa668d4e27d5.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/52df74cbd40dec69e2816431b471ddaa.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/db7e378b944850c556508188b29c00db.jpg"/><br/> D、无法比较