题目

  When it comes to friends, I desire those who will share my happiness, who possess wings of their own and who will fly with me. I seek friends whose qualities illuminate（照亮）me and train me up for love. It is for these people that I reserve the glowing hours, too good not to share.     When I was in the eighth grade, I had a friend. We were shy and “too serious” about our studies when it was becoming fashionable with our classmates to learn acceptable social behaviors. We said little at school, but she would come to my house and we would sit down with pencils and paper, and on10．在探究“影响电磁铁磁性强弱的因素”实验中，小明用相同的漆包线和铁钉绕制成电磁铁甲和乙，设计如图所示的电路．甲和乙串联的目的是控制两个线圈中的电流相等；闭合开关后，根据现象得出的结论是在电流一定时，电磁铁线圈的匝数越多，其磁性就越强．若让B铁钉再多吸一些大头针，滑动变阻器的滑片应向左端移动．