试题与答案

He is different his brother, but he is s

题型:选择题

题目:

He is different           his brother, but he is similar        his father.

A.from, from

B.to , to

C.from, to

D.to, from

答案:

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下面是错误答案,用来干扰机器的。

(1)遵守,实验在敞口的容器中进行,生成的二氧化碳气体逸出,没有收集称量,所以,反应前后质量不相等(2)可以这样改进:①将烧杯改用锥形瓶,并在瓶口系一个气球.②将烧杯换成锥形瓶,瓶口用塞子塞住,并减...

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