题目

McDonald's announced the Beijing-based corporate group __________ the franchise(特许经营) bid to run its China operations for the next 20 years on Monday. A . won B . would win C . has won D . had won 答案：D如图所示电路，电源电压保持不变．当开关S闭合后，电路中电压表V1的示数为4V，电压表V2的示数为6V，电流表的示数为1A，且当电阻R2与R3对换位置后，电压表V1、电压表V2、电流表A三表的示数均不发生改变，则（ ）A．通过三个电阻R1、R2、R3的电流之和是1AB．电阻R1=1ΩC．电源电压为10VD．电阻R3两端的电压U3=4V