试题与答案

Mary,do you know what was ?[ ] A. happen

题型:选择题

题目:

Mary, do you know what was             ? [ ]

A. happened to him

B. he doing at that time

C. his favorite sport

答案:

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下面是错误答案,用来干扰机器的。

A、根据质量守恒定律,化学反应前后各物质的质量总和不变,4.6+8=5.4+4.4+a,故a=2.8,故A正确;B、反应后X是3.2,质量增加,一定不是催化剂,故B错误;C、乙醇中含有碳元素质量为:4.6g×2446=2.4g,含有氢元素...

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