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| 21. | negative matrix |
| 底板|底片 |
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| 22. | bottom ejector plate |
| 喷射底板 |
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| 23. | floor of coal seam |
| 煤层底板 |
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| 24. | bottom slide of saddle |
| 刀架底板 |
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| 25. | backplane level |
| 底板级 |
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| 26. | moving end plate |
| 活络底板 |
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| 27. | electronic watch circuit disc |
| 电子表底板 |
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| 28. | bottom board for textile machines |
| 纺织机底板 |
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| 29. | collecting tray |
| 底板格 |
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| 30. | immediate bottom |
| 直接底板 |
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