题目

氮是大气中含量最多的一种元素，氮及其化合物在生产、生活中有着重要作用．请回答：（1）下列变化属于“氮的固定”的是 （填字母）a．植物从土壤中吸收氮肥b．硝酸和氨气反应生成氮肥c．将空气中的氮气转变为氮的化合物d．大豆的根瘤菌将含氮的化合物转变为植物蛋白质（2）据报道，意大利科学家获得了极具研究价值的N4 ， 其分子结构如图1所示．已知Ⅰ．断裂1mol N﹣N键吸收167kJ热量，形成1mol N≡N键放出942kJ热量，Ⅱ．N2 （g）+3H2（g）2NH3（gIV.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。错误涉及一个单词的增加、 删除或修改。增加:在缺词处加一个漏词符号(∧ ) ，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:在错的词下画一横线，并在该词下面写出修 改后的词。注意：1. 每处错误及修改均仅限一词；2. 只允许修改10处，多者(从第11处起) 不计分。My classmate Liu Hong is an warm-hearted girl. She is good at studying,dancing and playing piano. After hear Sichuan earthquake,she felt very sad about it. She decided to do something to helping Sichuan people. First she calls her friends up and came up with having a benefit show. Then she handed out advertisement with her friends or put up signs asking people to watch. Luckily,she did very good. A lot of people were moved and gave their hands to Sichuan people. At the last,she raised 5,000 yuan. She gave up all the money to the quake-hit areas.