【简答题】已知三相对称星形连接,电源相电压Uph为220V。对称三相负载,每相复阻抗Z=5∠60°Ω,作三角形连接,求各个线电流相量 。
【单选题】对称三相电源作星形连接,若已知UB=220∠60°,则UAB=()
【单选题】对称三相电源做星形连接,若已知U B =220∠60°,则U AB =( )。
【单选题】对称三相电源作星形连接,若已知UB=220∠60o,则UAB=()
【单选题】热原主要是微生物的内毒素,其致热中心是()
【单选题】The boy said to his mother in an ___ voice that she shouldn't have blamed him.