题目

在标准状况下,由CO和CO2组成的混合气体为 6.72 L,质量为12 g,此混合物中CO和CO2物质的量之比是______,CO的体积分数是______,CO的质量分数是______,C和O原子个数比是________,混合气体的平均相对分子质量是________,密度是______ g·L-   答案:1∶3 25% 17.5% 4∶7 40 1.7911.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仅限一词;(2)只允许修改10处,多者(从第11处起)不计分.Born to be the basketball player,Kobe Bryant showed his shooting talent in an early age.He has always been occupied with prove his skills on the court and improving himself.Having been enjoyed a successful high school basketball career,Kobe went straight into NBA after graduation.So far,Kobe have led the Lakers to four NBA champions.Thus,he is never content with his past achievements.He is famous for getting his teammates stay up late practising.when he learned a new move,he asks his teammates to practise with her until it is perfect."No matter how many time you win,you have to constantly look for ways to get better,"Kobe said.
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