 |
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| 美国标准管 (标定直径和厚度); 美国标准管件 | |||
| American standard pipe: 12 phrases in 7 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Drilling | 1 |
| General | 2 |
| Mechanic engineering | 2 |
| Metallurgy | 2 |
| Technology | 2 |
|
| |||
| 美国标准管 (标定直径和厚度); 美国标准管件 | |||
| American standard pipe: 12 phrases in 7 subjects |
| Automobiles | 1 |
| Aviation | 2 |
| Drilling | 1 |
| General | 2 |
| Mechanic engineering | 2 |
| Metallurgy | 2 |
| Technology | 2 |