與非門
與非門（NAND）係其中一個邏輯門，A同B要同時輸入1，輸出先至係0，如果唔係嘅話就會係1，效果等如先放一個與門，跟住放一個非門。
| 輸入 | 輸出 | |
| A | B | A NAND B |
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
 |
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