2022 英语周报 高二 XN 46答案

第四部分写作Sample writings第一节Hello, everyone, today I want to talk about my good neighboring family. There are 5members in their family, the parents, the grandparents and a son, who is about my age.The parents work hard and have distinguished carcers. The son, a good friend of mine, is oneof the top students in our school. The grandparents are at home doing housework. All of themalways wear a warm smile on their face, because they are confident about their life and work, aswell as the future. They are having a happy life

6B【解析】设小球的重力为G,圆环沿顺时针方向转动过程中,OP与竖直方向的夹角为a时,OP和OQ的拉力大小分别为T1、T2。由题意可知,小球的位置保持不动,受力保持平衡,由平衡条件可知,两绳拉力的合力不变,运用三角形定则作出力的合成图,如图小球受到的重力G和T1、T2组成一个闭合的三角形。由几何知识可知,T1、T2的夹角保持不变,为60,由正弦定理得1m0-=面=如如解得72=如c=,n2=在a从90转到0°的过程中,根据数学知识可知,sin(120°-a)先增大后减小,而sina减小,所以OP绳所受拉力先增大后减小,OQ绳所受拉力一直减小。故B正确

以上就是2022 英语周报 高二 XN 46答案，更多英语周报答案请关注本网站。