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| 往复泵上水或排水阀阀缸 | |||
| 阀室; 阀筒; 阀箱 | |||
| valve pot: 8 phrases in 4 subjects |
| Drilling | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 2 |
| Technology | 4 |
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