如图所示是测定两个电源的电动势和内电阻实验中得到的电流和路端电压图线。现将两电源分别与一滑动变阻器串联,电源1所在电路中电流为I1,路端电压为U1;电源2所在电路中电流为I2,路端电压为U2。则应有 ( ) A.当I1=I2时,两电源的总功率相等 B.当I1=I2时,两电源所接的外电阻相等 C.当U1=U2时,电源1的输出功率小于电源2的输出功率 D.当U1=U2时,电源1内部消耗的电功率小于My friend Bob sells his own programmes to doctors________ their
patients’ records on disk.
A.wanting to put
B.wanting putting
C.to want to put
D.to want putting