| |||
| ★ 火花探测器 | |||
| ★ 火花检波器 | |||
|
spark detector : 12 phrases in 7 subjects |
| Chemistry | 1 |
| Electronics | 1 |
| Metallurgy | 1 |
| Oil processing plants | 1 |
| Refrigeration | 1 |
| Space | 5 |
| Technology | 2 |
| |||
| ★ 火花探测器 | |||
| ★ 火花检波器 | |||
|
spark detector : 12 phrases in 7 subjects |
| Chemistry | 1 |
| Electronics | 1 |
| Metallurgy | 1 |
| Oil processing plants | 1 |
| Refrigeration | 1 |
| Space | 5 |
| Technology | 2 |