题目

补全对话 A: Where is that (1)n_________from? B: Jenny. She is (2)t_________loudly to her friends. A: They are too (3)l_________. Tell them to be (4)q_________. B: Why? A: The (5)b_________are sleeping. B: But I think they are (6)l_________to some music. A: This is fun! I hope they (7)e_________ the music. B: (8)W_________are you doing here? A: I’m (9)t_________care of the babies. B: But they don’t (10)n_________you now. A: OK. I’ll go and have a rest.在变电所里，需要用交流电表去监测电风上的强电流．由于电网中的电流通常会超过一般电流表的量程，因此常使用电流互感器．下面四个图中，正确反映电流互感器工作原理的是（　　）A．B．C．D．