在初中《动物学》教学中,为让学生实际观察到鸡蛋壳上的小气孔,我在课外组织了以下的观察演示实验。取具黄色壳的鸡蛋一个(白色壳薄易破),用小的缝衣针在蛋的较尖的一端小心地钻一孔,用装有5号针头的10毫升的注射器,先抽入10毫升空气,然后将针头沿扎好的小孔插入1/2(手不能摇动,否则空气和蛋清冒出),缓缓将空气注入蛋内。大约注入到2毫升空气时, In junior high school “zoology” teaching, in order to allow students to actually observe the stomata on the egg shell, I organized the following observation demonstration experiment after class. Take one egg with a yellow shell (thin white shell), carefully drill a hole with a small needle at the tip of the egg, and use a 10-ml syringe fitted with a 5-gauge needle to draw 10 Ml of air, and then insert the needle into the hole along the tie 1/2 (the hand can not shake, otherwise the air and egg white pops up), slowly inject air into the egg. When about 2 ml of air is injected,