【判断题】角度、直径、半径、弧长的尺寸起止符号宜用箭头表示。
【单选题】交流电路中的电流和电压的有效值的定义是利用的什么概念?
【单选题】A bank manager speaks My name is Jane Carson and I'm the manager of a savings bank in Portland, Oregon. My bank is open every day from 8: 30 in the morning until 4: 00 in the afternoon. On Fridays the...
【多选题】纯电阻交流电路中,下列说法正确的有:
C.
由于瞬时功率不方便用于表述电路的功率耗散,因此常采用一个周期内消耗功率的平均值,即有功功率来表述电阻的耗能状况。
【单选题】Sometimes the bank manager himself is asked to ______ checks ff his clerks are not sure about them.
【判断题】纯电阻电路中,电阻消耗电功率,电阻是耗能元件。