“测量小灯泡的电功率”实验中，电源电压为6V保持不变，小灯泡的额定电压为2.5V，小灯泡的电阻约为10Ω．
如果零上13℃记作+13℃，那么零下2℃可记作（ ）
Good morning！I'm Cindy.This is a1.It's my cup.2color is it？3 yellow and white.And what's this in English？It's4.It's an orange jacket.That's a pen.The pen is5.It's my purple pen.
