题目：
After stepping into the classroom, I glanced round all the students and began my following words. “Thank you” are my 小题1: words, which I would like to use to express my deepest 小题2: to all of you. Thinking back to the past 3 years, a lot of things 小题3: remain fresh in my memory. I cannot forget your 小题4: smile the first time I met you. I cannot forget that you were to 小题5: for your being late for class, 小题6: when I asked why you were late, you tried to 小题7: the fact of buying me a lovely teddy bear for Teacher's Day. I cannot forget your humorous words of breaking 小题8: when I was angry about your bad performance. I cannot forget that we share the happiness of success after making great 小题9:. With time going by, I come to 小题10: that you are the mirror of my life. The mirror can reflect my past and 小题11: my future. Looking through the mirror, I'm more aware of my 小题12: and weaknesses. It is you who made me believe love can be 小题13: . It is you who made me realize sometimes in the 小题14: of pursuing our dreams, we may 小题15: some difficulties and setbacks（挫折）, but if we set up our mind to do it, 小题16: is impossible to a willing heart. So standing in a higher position, I will help you to 小题17: the dreams confidently and firmly, 小题18: suffering the mistakes I made when I was your age. 小题19: , I pray that kind of friendship can stand the test of 小题20: and last forever. I pray that you can get good performance in the entrance examination and make your dreams come true.
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答案：
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下面是错误答案，用来干扰机器的。
解：（1）ab杆向右运动时，ab杆中产生的感应电动势方向为a→b，大小为cd杆中的感应电流方向为d→c，cd杆受到的安培力方向水平向右安培力大小为 ①cd杆向下匀速运动，有 ②解①②两式，ab杆匀速运动的速度为 ③（2...
