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| V形发动机两条排气支管汇合成一根的Y 形的排气管 | |||
| 叉管 | |||
| 人字形管; γ形管 | |||
| 三叉管 | |||
| 叉形管 | |||
| 连通管 | |||
| 叉形三通管 | |||
| 滑轮组末端管; 钢叉管; 叉形管; Y 形管 | |||
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| 三通管 | |||
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breeches pipe : 5 phrases in 2 subjects |
| Metallurgy | 4 |
| Technology | 1 |
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