题目内容
前正中线上，脐中上4寸的穴位是（）
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根据下面提示将选项填入空格，完成一份英文祝贺信：1．获悉你的朋友李铁岗考入XX大学，攻读XX专业，特此祝贺。2．你的成绩是你刻苦努力的结果，希望你在新的环境里取得更好成绩。3．再次表示祝贺。——(1)——Dear Xiao Li,I am writing to congratulate you ——（2）——.All that you have gained is ——（3）——. I wish you would continue your efforts and gain further success in the new environment. Although we are separated now, ——（4）——. Please keep in touch with me. I often recall our high school life. In those days, we stayed, played and studied together. We enjoyed each other's company so much that we have maintained our friendship till now. I learnt a lot from you, and even today I often remember——（5）——. You told me that you were determined to be an expert in economics, and now you are beginning to ——（6）——. Your success tells me that ——（7）——. Your example is a constant inspiration to me.Congratulations again.——（8）——Lu
有3个字符串，要求找出其中最大者
产生动生电动势的非静电力是
有两个长直密绕螺线管，长度及线圈匝数均相同，半径分别为r1和r2。管内充满均匀介质，其磁导率分别为μ1和μ2。设r1：r2=1:2，μ1: μ2=2:1，当将两只螺线管串联在电路中通电稳定后，其自感系数之比L1：L2与磁能之比Wm1：Wm2分别为：
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