Experiment materials: jar, windpipe, limewater, flume and the experiment record chart for each group.
Experiment materials: jar, windpipe, limewater, flume and the experiment record chart for each group.
学生用材料：广口瓶、导气管、石灰水、火柴、集气瓶、水槽和小组实验记录表。
Experiment materials: jar, windpipe, limewater, flume and the experiment record chart for each group.
学生用材料：广口瓶、导气管、石灰水、火柴、集气瓶、水槽和小组实验记录表。