凉开水放久了会产生有毒物质吗?我烧了一壶水,放了一个星期后,喝了.好像也没事.但不知道是否真的对身体无害.我个人认为,在封闭的环境里,水就是放一万年也坏不了.我的主要意思是:水放

来源:学生作业帮助网 编辑:作业帮 时间:2024/08/31 20:35:11
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