题干
| 1 |
| 3 |
| a |
| b |
| 1 |
| 3 |
| 2 |
| a |
| 3 |
| b |
| 3 |
| 1 |
| 2 |
答案(点此获取答案解析）
﹣
| 2 |
| 1 |
| 3 |
| a |
| b |
| 1 |
| 3 |
| 2 |
| a |
| 3 |
| b |
| 3 |
| 1 |
| 2 |
| 2 |
