 |
| |||
| 吊装式气门; 吊阀 | |||
| 下流阀 | |||
| 用具旋塞; 落座配汽阀; 落阀 | |||
| drop valve: 14 phrases in 8 subjects |
| Aviation | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Hydroelectric power stations | 1 |
| Mining | 1 |
| Oil / petroleum | 3 |
| Refrigeration | 1 |
| Technology | 5 |
|
| |||
| 吊装式气门; 吊阀 | |||
| 下流阀 | |||
| 用具旋塞; 落座配汽阀; 落阀 | |||
| drop valve: 14 phrases in 8 subjects |
| Aviation | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Hydroelectric power stations | 1 |
| Mining | 1 |
| Oil / petroleum | 3 |
| Refrigeration | 1 |
| Technology | 5 |