【简答题】发光二极管两端加 电压,它会发光;发光二极管工作时通常要串联一个 。
【单选题】— When______ you______ the smart hat? — While my parents were waiting for the plane at the airport.
【简答题】The plane at about 9:35 a.m. despite the heavy fog.
【单选题】流过发光二极管的电流不能过大,否则会烧坏管子,一般发光二极管的工作电流为 ,因此发光二极管在使用时必须串联一个 。 [填空(1)] [填空(2)]
【单选题】发光二极管加上正向电压时会发光,大部分发光二极管的正向工作电压为( )。
【简答题】The Princess was followed by five ——————when she got off the plane at the Pittsburgh International Airport.
【简答题】发光二极管两端加 电压,它会发光;发光二极管工作时通常要串联一个 。
【简答题】发光二极管的 PN结工作在 偏置时会发光。发光二极管的英文缩写是 。