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| 蜗壳型水轮机; 蜗轮 | |||
| 斜螺旋齿轮; 斜齿轮; 螺旋水轮; 螺旋式水轮机; 螺旋齿轮 | |||
| spiral wheel: 1 phrase in 1 subject |
| Drilling | 1 |
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