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21. | automatic lap former |
| 自动成卷装置 |
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22. | Lap lace-transform |
| 拉普拉斯变换 |
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23. | lap seam cathode |
| 叠缝阴极 |
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24. | waterproof lap pad |
| 防水衬褥 |
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25. | lap waste opener |
| 皮辊花机 |
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26. | rivet lap joint |
| 铆合互搭接头 |
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27. | single welded lap |
| 单面焊搭接 |
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28. | telescopic lap splice |
| 套接接头 |
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29. | interpass cold lap |
| 焊道内冷搭接 |
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30. | automatic lap counter |
| 自动游程记趟器 |
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