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| 孔内设备钻具下部、过滤器、深井泵等 | |||
| 井底设备 | |||
| 孔内设备 (过滤器，深井泵等); 井内设备 (过滤器、深井泵等) | |||
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bottom equipment : 6 phrases in 1 subject |
| Metallurgy | 6 |
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