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| 超声波清洗; 声波清洗 (用人耳听不到的高强度声波清洗精致零件的方法。超声波清洗器中待清洗的零件淹没在清洗液中。有高强度声波导致的振动会振落零件上的污渍) | |||
| 声波清洗; 超声波清理 | |||
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sonic cleaning : 1 phrase in 1 subject |
| Aviation | 1 |
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