【单选题】The map of Italian looks like a _________.
【单选题】The map of Italian looks like a _________.
【判断题】二极管两端加反偏电压时,一定工作在反向截止区。
【判断题】Recently, two Italian astronomers and an American environmental scientist created a world map.
【判断题】二极管的正极加上负电压,负极加上正电压,叫加上反偏电压,二极管截止