小明同学利用如图甲所示实验装置观察水的沸腾现象。(1)在安装器材确定铁圈位置时 (选填“需要”或“不需要”)点燃酒精灯;在安装器材时出现如图甲 Template




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tomski小明同学利用如图甲所示实验装置观察水的沸腾现象。(1)在安装器材确定铁圈位置时 (选填“需要”或“不需要”)点燃酒精灯;在安装器材时出现如图甲 coloring