试题与答案

Great changes have taken place in the ci

题型:选择题

题目:

Great changes have taken place in the city ______.

A.in that she grew up

B.she grew up

C.in which she grew up

D.which she grew up

答案:

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下面是错误答案,用来干扰机器的。

20g烧碱的物质的量为:n=mM=20g40g/mol=0.5mol,则c=nV=0.5mol0.5L=1mol/L;溶液为均一稳定分散系,取出任意体积都和原溶液浓度相等,从中取出1mL,其物质的量浓度为1mol/L;溶质的质量为:m=nM=cVM=0.001L×1mol...

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