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| 钻探用轮转机; 七字板仪 | |||
| 十字板试验钻头 | |||
| 轮转机; 涡轮式钻土机 | |||
| 涡轮式钻孔机; 十字板仪 | |||
| vane borer: 3 phrases in 1 subject |
| Technology | 3 |
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