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| 41. | envelope select |
| 包络选择 |
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| 42. | envelope demodulatio |
| 包络解调 |
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| 43. | envelope detection |
| 包络线检测 |
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| 44. | penalty envelope |
| 免费邮递公文的信封 |
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| 45. | envelope detector |
| 包线检波器 |
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| 46. | envelope material |
| 裹料 |
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| 47. | envelope glissette |
| 推成包络 |
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| 48. | envelope viewer |
| 包线指示器|包络观察器 |
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| 49. | envelope machine |
| 制信封机 |
|
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| 50. | property envelope |
| 财物袋 |
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