问题
选择题
下列反应可制得纯净氯乙烷的是
[ ]
A．乙烯通入浓盐酸中
B．乙烯与氯化氢加成反应
C．乙烷与氯气在光照下反应
D．乙烷通入氯水中
答案
答案：B
搜题请搜索小程序“爱下问搜题”
下列反应可制得纯净氯乙烷的是
[ ]
A．乙烯通入浓盐酸中
B．乙烯与氯化氢加成反应
C．乙烷与氯气在光照下反应
D．乙烷通入氯水中
答案：B
| 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。每句最多两处错误。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正后的词。 注意： 1.每处错误及其修改均仅限一词； 2.只允许修改10处，多者（从第11处起）不计分。 | |
| Last week, I visited Beijing. I always look forward to visit there.Therefore, I was so excitedly that I couldn’t fall asleep on the night before I started. I got up early and pack for the journey. In my pack, I put camera, some clothes, mobile phone and so on. It spent me 8 hours to go there by train. I visited some place of interest. They are very beautiful. I enjoyed myself. I felt tired and excited because I learned a lot of about the history of the city. As long as I arrived home, I phoned my boyfriend and told her about my journey. _______________________________________________________________________________ |