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| 水准管｛测｝ | |||
| 水准管; 泡沫管 | |||
| 管状水准器; 鼓泡管; 气泡水平仪; 气泡管 | |||
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bubble tube : 5 phrases in 3 subjects |
| Aviation | 1 |
| Polymers | 1 |
| Technology | 3 |
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