 |
| |||
| 无螺纹的光管端 | |||
| 平管口 | |||
| 平端; 管子未加厚端部 | |||
| 平滑端 (管材的); 直切管端; 平头 (管材的); 管材光端 (未修整和套丝的) | |||
| 管子未加厚端部; 无螺纹管端 | |||
| plain end: 49 phrases in 9 subjects |
| Architecture | 1 |
| Construction | 1 |
| Drilling | 2 |
| Hydroelectric power stations | 2 |
| Mechanics | 12 |
| Metallurgy | 8 |
| Oil / petroleum | 8 |
| Rail transport | 1 |
| Technology | 14 |