题目

人们结交的朋友通常有两种：与自己志趣相似的或不同的。两种朋友各有特点。请你以 “Friends, Similar or Different? ” 为题，按照以下的英文提示写一篇英语短文。 Some people choose friends who are different from themselves. Others choose friends who are similar to themselves. Compare the advantages of having friends who are different from you with the advantages of having friends who are similar to you. Which kind of friend do you prefer for yourself? Why? 注意：词数120左右，文章的题目和开头已给出（不计词数）。 Frien电荷量为Q1、Q2的两个正电荷分别置于A点和B点，两点相距L．在以L直径的光滑绝缘半圆环上，穿着一个带电小球+q（视为点电荷），在P点平衡．不计小球的重力，那么PA与AB的夹角α与Q1、Q2的关系应该满足什么关系？