用浓度为95%和70%的酒精溶液配制75%的消毒酒精1千克,需这两种酒精各多少克?
用浓度为95%和70%的酒精溶液配制75%的消毒酒精1千克,需这两种酒精各多少克?
其他人气:298 ℃时间:2019-10-19 21:19:29
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