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81. | direction sensor |
| 方向传感器 |
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82. | direction of principal axis |
| 轴方向 |
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83. | direction of propagation |
| 传播方向 |
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84. | directional field |
| 方向场 |
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85. | direction of spiral |
| 螺旋方向 |
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86. | direction search |
| 方向搜索 |
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87. | direction of winding |
| 绕线方向 |
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88. | Directional Angles |
| 方向角 |
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89. | direction plate |
| 方向板 |
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90. | alternate directions |
| 交错方向 |
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