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问题 选择题

关于小苏打水溶液的表述正确的是 [ ]

A．c(Na+)=c(HCO3-)+2c(CO32-)+c(H2CO3)

B．c(Na+)+c(H+) =c(HCO3-)+c(CO32-)+c(OH-)

C．HCO3-的电离程度大于HCO3-的水解程度

D．存在的电离有：NaHCO3=Na++HCO3- HCO3-H++CO32- H2OH++OH-

答案

答案：D

选择题

— What do you think of our manager, Mr Smith?

— He is really________success in his career, but in a way he is________failure in his family. [ ]

A. a; /  

B. the; the

C. a; a  

D. /; /
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选择题

单项选择。

Danny and Jenny will leave            Canada and arrive             China tomorrow. [ ]

A. in, in

B. for, at

C. for, in

D. /, in

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