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81. | dual-control column |
| 双重控制杆 |
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82. | dual exchange rate |
| 双重汇率 |
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83. | twofold classification |
| 双重划分 |
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84. | dual amplification |
| 双重放大 |
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85. | Double Balanced mixer |
| 双重平衡混频器 |
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86. | dual modulation |
| 双重调制 |
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87. | Two-tier system; Double-track system |
| 双重机制 |
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88. | duplex equipment |
| 双重设备 |
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89. | conflicting loyalties |
| 双重效忠 |
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90. | double beta decay |
| 双重β衰变 |
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