将amol/L Al2（SO4）3和钾离子浓度为2bmol/L的K2SO4混合溶液500mL加水稀释到2L，则稀释后的溶液中SO42﹣的浓度为

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将amol/L Al₂（SO₄）₃和钾离子浓度为2bmol/L的K₂SO₄混合溶液500mL加水稀释到2L，则稀释后的溶液中SO₄²^﹣的浓度为（）

A： $\frac{(a + b)}{4}$ mol/L

B：4（3a+b） mol/L

C：4（a+b） mol/L

D： $\frac{(3 a + b)}{4}$ mol/L

上一题下一题 0.0难度选择题更新时间:2019-06-02 04:03:28

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D

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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。

People often come up across the word ＂SOHO＂ in the newspaper or magazine. But not everyone knows how it means. As the matter of fact, ＂SOHO＂ means ＂Small Office/ Home Office＂. Now many people use computer, so it is possible for you to work at their homes. They needn't go to offices. They can usually work fast and better at home. By work at home, they save a lot of time and energy. They needn't spend time on the road but they won't feel tired or angry because the bad traffic. Maybe in the future, more and more people would be＂SOHO＂ workers.

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