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| 油罐顶部量油孔 | |||
| 测量液位口量油口 | |||
| 计量取样孔; 量油孔; 量油口 | |||
| 计量口 | |||
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gauge hatch : 4 phrases in 2 subjects |
| Oil / petroleum | 3 |
| Rail transport | 1 |
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