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| 加肋管; 带散热片的管子 | |||
| 圆翼加肋，翅形管 | |||
| 肋片管 | |||
| 肋管; 带肋片的管子; 翅片管 | |||
| gilled pipe: 1 phrase in 1 subject |
| Technology | 1 |
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