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| 球阀座; 球座 | |||
| 球形阀座; 球面座 | |||
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| 球座 | |||
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ball seat : 19 phrases in 5 subjects |
| Automobiles | 2 |
| Drilling | 5 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 3 |
| Technology | 8 |
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