30. 下列何者為 JK 正反器的激勵表 (excitation table) ?
(A)
(B)
(C)
(D)

| Q_{n} | Q_{n+1} | J | K |
| --- | --- | --- | --- |
| 0 | 0 | 0 | X |
| 0 | 1 | 1 | 0 |
| 1 | 0 | 0 | 1 |
| 1 | 1 | X | 0 |

| Q_{n} | Q_{n+1} | J | K |
| --- | --- | --- | --- |
| 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | X | 0 |

| Q_{n} | Q_{n+1} | J | K |
| --- | --- | --- | --- |
| 0 | 0 | 1 | X |
| 0 | 1 | 0 | X |
| 1 | 0 | X | 0 |
| 1 | 1 | X | 1 |

| Q_{n} | Q_{n+1} | J | K |
| --- | --- | --- | --- |
| 0 | 0 | 0 | X |
| 0 | 1 | 1 | X |
| 1 | 0 | X | 1 |
| 1 | 1 | X | 0 |