试题与答案

如图是电解水的实验装置,对该实验描述正确的是 A.正极产生的气体是氢气 B.电

题型:选择题

题目:

如图是电解水的实验装置,对该实验描述正确的是

A.正极产生的气体是氢气

B.电解过程中水分子发生了改变

C.生成氧气、氢气的体积比约为2:1

D.该实验能证明水是由氢气和氧气组成

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:一种动物实验可能不能预测药物对人的毒性,但在几种动物中,大多数在人身上发生的急性毒性可以在动物上反映出来。药物的危险程度要至少在两种动物上试验,但灵长类动物不是必须的,治疗指数不是...

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