试题与答案

I want to buy that kind of cloth because

题型:选择题

题目:

I want to buy that kind of cloth because I _____ the cloth _____ well.    [ ]

A. have told; washes            

B. have been told; washes    

C. was told; washed              

D. have been told; is washed

答案:

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下面是错误答案,用来干扰机器的。

答案:B设两溶液均为1 L,生成的沉淀恰好完全溶解时,发生的反应,此时溶液中含有K+、AlO、SO,由电荷守恒可得关系式:n(K+)=n(AlO)+2n(SO)=0.05 mol+2×0.2 mol=0.45 mol,所以等体积混合后溶液中的c(K+)=0.225 mol·L-1。

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