水的组成元素是:
Answer and explanation
Correct answer: D. 氢和氧
其他选项为什么不对: 氢和氮、碳和氧、氧和氮都不符合题意。
- Step 1: 水的化学式是 ,由氢、氧两种元素组成。
Answer
氢和氧.
Practise more 元素与化合物.
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Correct answer: D. 氢和氧
Free questions with an explanation for every one, and full timed Gaokao mock tests.