题型:名词解释 Near the table ________ a poor dog, who desired to satisfy his hunger with something _________ fell from the table.A.laid; whichB.lay ; thatC.laid ; thatD.lay ; what 查看答案
题型:名词解释 某水电站,用总电阻为2.5Ω的输电线输电给500km外的用户,其输出电功率是3×106kw.现用500kV电压输电,则下列说法正确的是( ).A.输电线上输送的电流大小为2.0×105AB.输电线上由电阻造成的损失电压为15kVC.若改用5kV电压输电,则输电线上损失的功率为9×108kWD.输电线上损失的功率为ΔP=U2/R,U为输电电压,R为输电线的电阻 查看答案