 |
| return piping: 10 phrases in 7 subjects |
| Automobiles | 1 |
| Construction | 4 |
| Electronics | 1 |
| Pipelines | 1 |
| Refrigeration | 1 |
| Technology | 1 |
| Thermal engineering | 1 |
|
| return piping: 10 phrases in 7 subjects |
| Automobiles | 1 |
| Construction | 4 |
| Electronics | 1 |
| Pipelines | 1 |
| Refrigeration | 1 |
| Technology | 1 |
| Thermal engineering | 1 |