____.
—This history book is of great value.
—Exactly. _____ can be enjoyed from it ______ you have a deep understanding of it, however.
温度（℃）
0
10
20
40
60
80
100
KNO3的溶解度（g）
13.3
20.9
31.6
63.9
110
169
246
NaCl的溶解度（g）
35.7
35.8
36.0
36.6
37.3
38.4
39.8
下列有关跨膜运输的说法不正确的是（ ）
