将下列问句答句连线。
①What's this?____ A. Yes, I do.
②Is this a bear? ____ B. It's a bee.
③What do you see?____ C. No, it isn't.
④Do you see a monkey?____ D. I see a frog.
在测定“小灯泡电功率”的实验中,电源电压为4V,小灯泡额定电压为3V、电阻约为10Ω.