题干

墨墨和朋友在一起踢足球时不小心摔倒,将膝盖擦伤,他为了将一杯9g质量分数为10%的NaCl溶解,配制成0.9%的生理盐水(主要成分为NaCl溶液)来清洗伤口,则需要水的质量为(  )

A:100g

B:91g

C:109g

D:80g

上一题 下一题 0.0难度 选择题 更新时间:2019-08-16 11:43:25

答案(点此获取答案解析)

B

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