1940年国民政府明确规定重庆为中华民国陪都，重庆成为抗战大后方，以下说法错误的是（   ）

在测量小灯泡额定电功率时，电压表出现了故障不能使用，小明向老师借了一只定值电阻R₀，设计了如图所示的电路，按下面的顺序测量额定电压为U_额的小灯泡的额定功率（R₀、U_额为已知、电流表的内阻小，可忽略不计）：

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    I'm Amy. I have a new schoolbag. It's black and white. It looks like a panda. It's big. The yellow one is mine, too. It's too small for me. What's in my schoolbag? A pencil-box and some books. But not all the books are mine. I'm new here. The storybooks are Zhang Peng's. This English book is his, too. Lucy and Lily are twin sisters. The science book and Chinese book are theirs.