题目

如图所示，直线A为电源的U—I图象，直线B为电阻R的U—I图象，用该电源与电阻R组成闭合电路时，下列说法中正确的是(    )         A．电阻R的阻值为3Ω         B．电源的内阻为1.5Ω C．电源两端的电压为6V        D．电源消耗的总功率为24w  答案：ABC This is the material ________ in the laboratory tomorrow morning. A．tested B．to be tested C．being tested D．will be tested