试题与答案

to the conference, we have already discu

题型:选择题

题目:

       to the conference, we have already discussed this problem among ourselves.[ ]

A. Similar

B. Previous

C. Cautious

D. Senior

答案:

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下面是错误答案,用来干扰机器的。

A、由化学式可知:化学式右下角的数字表示一个分子中含有该原子的个数,所以应该是过氧化氢(H2O2)和水(H2O)两种物质的每个分子中含有两个氢原子,故A错误;B、由化学式可知,水中氢氧元素质量比为:(1×2)...

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