【简答题】The circuit is in steady-state, when ,the switch is closed. When , , .
【单选题】The resonant angular frequency for a series RLC circuit is , when , the circuit is:
【判断题】在实际工作中,全距常用来检查产品质量的稳定性和进行质量控制。 ( )
【单选题】The circuit is in steady-state, when , the switch is opened. Then is:
【简答题】若 ,则向量 的夹角为________.
【简答题】若向量 与 的夹角为120° ,且 ,则 与 的夹角 为 .