发布时间:2025-01-18 10:52:42
一般来说,石头的成分没有确定之前,不要长时间接触。比如,一块拿来把玩的石头,睡觉时,不要放在床头,至少也要一两米外。因为一些劣质石材,会散发出有害气体,比如氡,是严重的致癌物,小心一点好。
怎样造出人工雾 是这样的我想在家里的鱼缸的水面上造出一层厚厚的雾请教一下各位谢谢
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