侯英超 | 发布日期:2010-04-29 19:09:45
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小明在实验室完成了很多探究实验,并填写了实验报告,其中现象或结论正确的是 A. 在一支试管中分别加入2~3ml水和几滴植物油,振荡,得到的是悬浊液 B. 用小木棍蘸少量浓硫酸在白纸上写字,一会儿白纸变黄,最后变黑,小木棍也变黑了 C. 在一支试管中加入几小段镁条,再加入5ml盐酸,观察到镁条表面有气泡,用手触摸试管外壁,感觉不到温度的变化 D. 向一个收集满二氧化碳气体的质地较软的塑料瓶中加入约三分之一体积水,立即旋紧瓶盖,振荡,塑料瓶没有明显变化 |