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| 变径肘管; 渐缩弯头; 异径肘管 | |||
| 缩小弯头 | |||
| 异径弯头 | |||
| 异径弯管 (接头); 渐缩弯管; 大小头弯管; 变径弯头; 异径弯管接头 | |||
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reducing elbow : 7 phrases in 3 subjects |
| Drilling | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |
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