论文部分内容阅读
在现行教材里,空气的成分实验是这样进行的:“在水槽里点燃一支蜡烛,用一个上面开口的玻璃钟罩很快把蜡烛罩起来,再很快地用
In the current textbook, the experiment of air composition is done as follows: "Light a candle in the sink, cover the candle quickly with a glass bell jar with an open top,