论文部分内容阅读
一、实验材料试管1只,清水20毫升, 食盐少许,软木塞1个,肥皂少许。二、实验过程取试管,注入2～3毫升清
First, a test tube material, 20 ml of water, a little salt, cork 1, a little soap. Second, take the test tube test, injection 2 ~ 3 ml clear