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给烧瓶里的水加热,当玻璃弯管喷口出现“白气”时,教室里气氛活跃,教师引导学生仔细观察。 生:“白气”是离开喷口一段距离才有的。
Heating the water in the flask, when the glass elbow spout “white gas”, the classroom atmosphere, the teacher led the students to observe carefully. Health: “white gas” is only a distance away from the spout.