题目：
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| One day I took a bus with my girlfriend. It was so 1 that we stood for several stops until a vacant seat was 2 for her. Then a pretty girl rushed towards me, saying, "Hi, where are you going?" I was so struck by the stranger that I had a hard time trying to 3 her. Clearly she had taken me 4 somebody else. I returned her greeting with politeness, 5 to give explanation to my girl-friend later. Noticing my dialogue with somebody else, my girlfriend 6 her eyes and found she was pretty. She asked jealously, "Who's she?" The pretty girl, quite 7 of the situation, spoke out first, "Hi, let me 8 myself. I'm Nancy, used to be 9 . Very glad to meet you." She behaved very 10 . But I was 11 to search in my memory for someone called Nancy among my neighbors. I was worrying how to explain this to my girlfriend 12 the pretty girl again turned to me, "Will you give me your cell phone number so that we 13 keep contacts (联系) later?" I had to submit to her 14 . Then the girl got off the bus at the next stop. A minute later I got a short 15 on my phone-from a stranger. My girlfriend 16 my phone and read the note. It was from the girl, who said, "Just now, two thieves tried to 17 your pocket. I had to act as an acquaintance to draw your attention I should have left at the 18 stop but gave up as I noticed these two thieves also 19 to leave at the same stop. Because of the 20 I delayed my departure. Now you'll understand all I have done to you. Wish you luck." | ||||
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答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：理想变压器的工作原理是原线圈输入变化的电流时，导致副线圈的磁通量发生变化，从而导致副线圈中产生感应电动势．而副线圈中的感应电流的变化，又导致在原线圈中产生感应电动势．变压器的电流比...
