题干
—Did you see _______ lions playing in the zoo last week?
—No, they were all sleeping. But I saw _______ cute monkeys.
A：some; any
B：some; some
C：any; some
D：any; any
答案(点此获取答案解析）
C
，副线圈中接有定值电阻R。当原线圈从AC端输入电压为U的正弦交流电压时，原线圈中电流为I，电阻R上消耗的功率为P。当原线圈从AB端输入电压为U的正弦交流电压时，原线中电流为
，电阻R上消耗的功率为
。那么
