| ① | ② | ③ | ④ |
t = 0 | C1 | 0 | 0 | 0 |
t = 0.5 | C1 | 0 | 0 | 0 |
t = 1 | C1 | 0 | 0 | 0 |
t = 1.5 | C4 | C2 | 0 | 0 |
t = 2 | C4 | C2 | C3 | 0 |
t = 2.5 | C4 | C2 | C3 | 0 |
t = 3 | 0 | 0 | C3 | 0 |