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| 31. | envelope select |
| 包络选择 |
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| 32. | envelope demodulatio |
| 包络解调 |
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| 33. | envelope detection |
| 包络线检测 |
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| 34. | penalty envelope |
| 免费邮递公文的信封 |
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| 35. | envelope detector |
| 包线检波器 |
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| 36. | envelope material |
| 裹料 |
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| 37. | envelope glissette |
| 推成包络 |
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| 38. | envelope viewer |
| 包线指示器|包络观察器 |
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| 39. | envelope machine |
| 制信封机 |
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| 40. | property envelope |
| 财物袋 |
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