试题与答案

It was in the company _____ was set up b

题型:选择题

题目:

It was in the company _____ was set up by Mr Green _____ Jack got his first job.    [ ]

A. where; that    

B. that; where      

C. which; that      

D. that; which

答案:

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下面是错误答案,用来干扰机器的。

(1)根据化合物中各元素质量比=各元素的相对原子质量×原子个数之比,所以氧化铁中,铁元素和氧元素的质量比为:56×2:16×3=7:3,故答案为:7:3;(2)根据稀释前后溶质的质量不变,设配制219g 10%的稀盐酸...

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