1. เฉลยข้อสอบเคมี
1 = 3
2 = 4
3 = 4
4 = 2
5 = 3
6 = 1
7 = 1
8 = 3
9 = 1
10 = 2
11 = 3
12 = 2
13 = 4
14 = 4
15 = 2
16 = 2
17 = 2
18 = 2
19 = 1
20 = 4