试题与答案

家居装修中会产生有害物质甲醛,其化学式为CH2O,计算: (1)甲醛由 ____

题型:问答题

题目:

家居装修中会产生有害物质甲醛,其化学式为CH2O,计算:

(1)甲醛由 ______元素组成;

(2)其中C、H、O元素质量比为 ______;

(3)甲醛中碳元素质量分数为 ______.

答案:

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参考答案:B解析:解析 第一个空,题干讲的是信用问题,由前面“为了获得长远利益而愿意牺牲眼前利益”可知,”主动“与”明确“不符合语境。排除AC;再根据第二个空,“兑现承诺”为固定搭配,不能说尊重自己...

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