问题 选择题

在容积一定的密闭容器中,可逆反应:A2(g)+ B2(g)xC(g) 符合下列图Ⅰ所示关系,由此推断对图Ⅱ的正确说法是

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A.P3<P4,Y轴表示A2的转化率

B.P3<P4,Y轴表示A2的浓度   

C.P3>P4,Y轴表示混合气体的密度  

D.P3>P4,Y轴表示混合气体的平均摩尔质量

答案

答案:D

填空题
写作题

二班的同学进行了一场有关英语学习的讨论。讨论的题目是:学习英语要不要从儿童时期开始。请你根据下表中的提示写一篇短文,介绍讨论的情况。一些同学认为.1应从儿童时期开始学习英语  2.儿童时期记忆力好,可以记  住很多单词 3.能为以后的英语学习打下坚实的基础           另一些同学认为1.不应从儿童时期开始学英语  2.儿童时期既要学拼音又要学英语,易混淆 3.会影响汉语学习和今后的英语学习  最后讨论未取得一致意见

参考词汇: 汉语拼音---Chinese pinyin 打下坚实基础lay a solid foundation 混淆mix up

A heated discussion was held about whether it is necessary to start learning English from childhood in Class 2 . Their opinions are quite different from each other.____________________________________________________

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