在“测定小灯泡的电功率”的实验中，使用用如图甲所示的电路，其中电源电压保持6 V不变，小灯泡额定电压为2.5 V(灯丝电阻约为12 Ω)。
- Junior high school days will be over _______ a week. How are you feeling?
- I'm trying to keep my cool because we've been together ________ three years.
