| |||
| 可变滤波器 | |||
|
variable filter : 30 phrases in 11 subjects |
| Air defense | 2 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 6 |
| Geology | 1 |
| Geophysics | 3 |
| Oil / petroleum | 1 |
| Oil processing plants | 2 |
| Space | 3 |
| Technology | 8 |
| Television | 2 |
| |||
| 可变滤波器 | |||
|
variable filter : 30 phrases in 11 subjects |
| Air defense | 2 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 6 |
| Geology | 1 |
| Geophysics | 3 |
| Oil / petroleum | 1 |
| Oil processing plants | 2 |
| Space | 3 |
| Technology | 8 |
| Television | 2 |