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| 大小头指管 | |||
| 缩管接; 异径大小头管接 | |||
| 异径管 | |||
| 异径短节 | |||
| 钻杆异径接头 | |||
| 渐缩管 | |||
| 变径管节; 大小头 | |||
| 管道变径接头 | |||
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pipe reducer : 1 phrase in 1 subject |
| Technology | 1 |
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