2022英语周报高一牛津第40期答案

书面表达Dear sir or madamI am Li Hua, a middle school student from China who is crazy about differentcultures around the world. Recently, I learned on your official website that therell be a summer camp in my city. I'm writing to participate in it.First, having learned English for almost ten years, I can speak English flu-ently. Moreover, with the development of China, there are more and more young-sters who show great interest in Chinese culture and this is really a wonderfulportunity for us to communicate the different cultures with each other, I will he a-hle to learn from other cultures to broaden my horizons and spread Chinese cultureI hope I can he accepted as a member in your summer caLooking forward to your reply.RegardsLi H

19.(10分)(1)平衡压强(1分)(直形)冷凝管(1分)2)①C(2分)②不受影响(2分)(3)0057(v1av2×100%(2分)(4)寻找最佳实验条件(2分)【解析】(1)a管的作用是平衡压强仪器d的名称是(直形)冷凝管(2)①此实验是利用高氯酸(高沸点酸)将样品中的氟元素转化为HF(低沸点酸)蒸出。硝酸和盐酸易挥发,A、B项错误;硫酸沸点高,难挥发,C项正确。②SF;水解生成HF,若有SiF,生成对实验结果无影响(3)氟化稀土样品中氟的质量分数=ov=eV2)×10-mo×3×19g·mo×100%9.057y=V)×100%,(4)该操作的目的是通过做对比实验,寻找最佳实验条件

以上就是2022英语周报高一牛津第40期答案，更多英语周报答案请关注本网站。