题目

根据表提供的数据,判断在等浓度的NaClO、NaHCO3混合溶液中,各种离子浓度关系正确的是() 化学式电离常数 HClOK=3×10−8 H2CO3K1=4.3×10−7 K2=5.6×10−11       A.     c(ClO−)>c(HCO3−)>c(OH−) B. c(Na+)=c(HCO3−)+c(CO32−)+c(ClO−)+c(HClO) C. c(HClO)+c(ClO−)=c(HCO3−)+c(H2CO3) D. c(Na+)+c(H+)=c(HCO3−)+c(ClO−)+C(OH−)+2c(CO32−)你是校报英语版编辑Jack Smith，主要负责“你问我答”专栏，请就中学生李华的来信作答，给出适当建议。Dear Mr. Smith,I’m a Senior 3 student. I have to take English exams every two weeks. But the results are always discouraging in spite of my great efforts. I don't know why. I 'm afraid something is wrong with my English learning method. What’s worse, before each exam, I'm always feeling nervous and cannot sleep well. Could you give me some suggestions?Li Hua注意：针对提出问题，给出信息完整的建议；适当增加细节，以使行文连贯；词数：100左右。开头与结尾已为你写好，不计入总词数。Dear Li Hua, I’ve just got your letter and I know learning a foreign language can be challenging for some people.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Sincerely yours,Jack Smith