题目

如图所示，小华用弹簧测力计、量筒、小石块和细线，测量某种液体的密度． a．将小石块用细线悬吊在弹簧测力计下，记下测力计示数F1 ． b．读出量筒中待测液体的体积V1 ． c．将小石块浸没在待测液体中，记下弹簧测力计示数F2和量筒中液面对应的刻度V2 ． （1） 使用弹簧测力计前，应检查指针是否指在． （2） 小石块浸没在待测液体中时，排开液体的重为G=． （3） 待测液体的密度可表示为ρ液=． （4） 小华还算出了小短文改错假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处,每处错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号（∧）,并在其下面写出该加的词。删除：把多余的词用斜线（\）划掉。修改：在错的词下划一横线,并在该词下面写出修改后的词。注意：1. 每处错误及其修改均限一词。2. 只允许修改10处,多者（从第11处起）不计分。I just came back from Britain last week. I was luckily enough to be one of the students from different country to visit the UK from Feb .16 to 28 . We paid a visit to a good many of places , like London ,Oxford or the Lake District . I learned much about British culture and history in London ,where was my favourite . I also liked Oxford , in which I saw much old buildings. The Lake District was beautiful , but it was pity that it rained heavily when they were there. The most excited thing for me in Britain was that I make a lot of friends there.