null sequence
| protection
| null sequence | |
| busin. | 零序列 |
| el.mach. | 零 序 |
| protection | |
| gen. | 保障 |
| forestr. | 防火 |
| hydroel.st. | 保护; 防护; 保护装置; 保护措施 |
| interntl.trade. | 保护贸易制; 保护政策 |
| med.appl. | 护具 |
| met. | 保存 |
| |||
| 零序列 | |||
| 零相序 | |||
| 零序 (列) | |||
|
null sequence : 20 phrases in 4 subjects |
| Electric machinery | 17 |
| Electronics | 1 |
| Space | 1 |
| Technology | 1 |