A:3
B:5
C:312
D:12
主族
周期
ⅠA
ⅡA
ⅢA
ⅣA
ⅤA
ⅥA
ⅦA
0族
1
①
②
2
③
④
⑤
⑥
⑦
3
⑧
⑨
⑩
All the students p____ at the lecture were deeply touched by his success story.
《三国演义》的作者是( )
已知点P(a+1,2a﹣3)在第一象限,则a的取值范围是( )