2、D
3. A.
4、B
5、D
6、C
7. A.
8、B
9、C
10、C
1 1、8.4
12、8
13, 120 degrees
14、0.6
15、80
16, yes
17、0
/kloc-64 in 0/8,729 (it can also be the 6th power of 3 or the 6th power of 2).
19、 1.8
20、89
2 1. Prove that A is congruent with 1+ 1-2 (module 37).
22, ( 1) 1
(2) Article 6
23、6