Similar to 水素イオン指数
COBOL
COBOL▲1 trendsCommon Gateway Interface
Common Gateway InterfaceConcurrent Versions System
Concurrent Versions System1
1▲1 trends2
23
34
46
67
78
89
913
13 (number)19
19 (number)40
40 (number)70
70 (number)1000000
1,000,000酸と塩基
Acid–base reactionHSAB則
HSAB theory塩基
Base (chemistry)酸
Acid10世紀
10th century11世紀
11th century12世紀
12th century13世紀
13th century14世紀
14th century15世紀
15th century16世紀
16th century18世紀
18th century▲1 trends