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我们把“根吸水实验”作了一些改进,现将改进方法介绍如下: 选取长约12厘米,粗端直径约为3厘米的胡萝卜(肥大直根)一个,用7毫米打孔器从粗端正中垂直打一深为3厘米的洞。第二次打孔时,打孔器仍然从原洞口插入,只是要偏斜一点,大约与第一洞斜15度左右(角度过大会将萝卜皮打破!)。这样依次旋转胡萝卜,连续打洞,最后形成一个上口小(7毫米)下底大的坛状窟窿。清除窟窿中的碎块并注入染成红色(加几滴红墨水)的浓糖溶液,插上一支长15厘米,直径8毫米的玻璃管(如图)。由于玻管的
We made some improvements to the “root-water absorption experiment”. Now we introduce the improvement method as follows: Take a carrot with a diameter of about 12 cm and a rough end diameter of about 3 cm. In a vertical hole in a depth of 3 cm. The second punch, the hole punch is still inserted from the original hole, but to be a little skewed, about 15 degrees with the first hole about oblique (the angle of the assembly will be broken radish!). In turn turn the carrots, continuous hole, and finally form a small mouth (7 mm) under the big altar hole. Clear the hole in the hole and pour into red (add a few drops of red ink) of concentrated sugar solution, insert a 15 cm long, 8 mm diameter glass tube (pictured). Because of the glass tube