| |||
| 无源检测 | |||
| 无源检［探］测 | |||
| ★ 无源探测 | |||
| 无源检波; ★ 被动探测 | |||
|
passive detection : 43 phrases in 13 subjects |
| Air defense | 8 |
| Automobiles | 2 |
| Aviation | 2 |
| Computer networks | 2 |
| Earth sciences | 3 |
| Electronics | 7 |
| General | 2 |
| Geophysics | 1 |
| Oil / petroleum | 1 |
| Radio | 2 |
| Space | 10 |
| Technology | 2 |
| United Nations | 1 |