人教版的高中《生物》 ,其权威性不容置疑 ,但在课本的Ｐ 52上有这样一段话 :“一个典型的渗透装置必须具备两个条件 :一是半透膜 ,二是半透膜两侧的溶液具有浓度差。”笔者认为这段话欠妥。现分析如下 :我们知道 ,渗透作用的原理是 :在半透膜两侧的溶液中 ,单位体积内的溶剂分 There is no doubt about the authoritative nature of PEP’s high school “Biology”, but there is a paragraph on P 52 of the textbook: “A typical penetration device must have two conditions: one is a semipermeable membrane and the other is a semipermeable membrane. The two sides of the solution have a difference in concentration." I believe that this paragraph is not properly. The analysis is as follows: We know that the principle of permeation is: in the solution on both sides of the semipermeable membrane, the solvent volume per unit volume